diff --git a/changelog.d/fixes/10732-copilot-m365-invocation-refresh.md b/changelog.d/fixes/10732-copilot-m365-invocation-refresh.md
new file mode 100644
index 0000000000..acbfbbe693
--- /dev/null
+++ b/changelog.d/fixes/10732-copilot-m365-invocation-refresh.md
@@ -0,0 +1 @@
+- **fix(providers):** copilot-m365-web chat turns no longer surface as `(empty response)` — the type:4 invocation is aligned with the 2026-08 wire shape and now carries its type:1 Metrics follow-up in the same socket write, and the access token pre-flight-refreshes from a stored refresh_token instead of requiring a DevTools re-capture every ~75 minutes ([#10732](https://github.com/diegosouzapw/OmniRoute/pull/10732) — thanks @acc0mplish)
diff --git a/docs/reference/PROVIDER_REFERENCE.md b/docs/reference/PROVIDER_REFERENCE.md
index d6dcf8abb2..64dc00960d 100644
--- a/docs/reference/PROVIDER_REFERENCE.md
+++ b/docs/reference/PROVIDER_REFERENCE.md
@@ -91,7 +91,7 @@ Use the dashboard at `/dashboard/providers` to enable, configure, and test each
 | `chatgpt-web-codex` | `cgpt-codex` | ChatGPT Web (Codex) | Web cookie | [link](https://chatgpt.com) | Paste the full ChatGPT Cookie header. OmniRoute verifies it in an isolated headless browser profile. | native |
 | `claude-web` | `cw` | Claude Web | Web cookie | [link](https://claude.ai) | Paste your session cookie from claude.ai | none |
 | `conol-web` | `cnl` | Conol (Unofficial/Experimental) | Web cookie | [link](https://conol.ai) | Use browser sign-in, or paste the full Cookie header from conol.ai. The __Secure-better-auth.session_token cookie is required. | — |
-| `copilot-m365-web` | `m365copilot` | Microsoft 365 Copilot (BizChat) | Web cookie | [link](https://m365.cloud.microsoft/chat) | Sign in at m365.cloud.microsoft/chat, then open DevTools → Network → filter 'WS' → click the Chathub WebSocket connection. Copy both the access_token query parameter AND the account-specific Chathub path segment from its request URL (wss://…/Chathub/<path>?…&access_token=…). It is NOT an Authorization: Bearer header on an XHR/Fetch request. The token is short-lived; this is an unofficial integration. | — |
+| `copilot-m365-web` | `m365copilot` | Microsoft 365 Copilot (BizChat) | Web cookie | [link](https://m365.cloud.microsoft/chat) | Sign in at m365.cloud.microsoft/chat, then open DevTools → Network → filter 'WS' → click the Chathub WebSocket connection. Copy both the access_token query parameter AND the account-specific Chathub path segment from its request URL (wss://…/Chathub/<path>?…&access_token=…). It is NOT an Authorization: Bearer header on an XHR/Fetch request. The token is short-lived; this is an unofficial integration. Optional: store a refresh_token in providerSpecificData.refreshToken (any Microsoft device-code/refresh flow for the substrate.office.com/sydney scopes) and OmniRoute pre-flight-refreshes the access token itself — otherwise re-capture after every ~75 min expiry. | — |
 | `copilot-web` | `copilot` | Microsoft Copilot Web | Web cookie | [link](https://copilot.microsoft.com) | Paste the access_token from an authenticated copilot.microsoft.com request (DevTools → Network → Authorization), or export a HAR while logged in | — |
 | `deepseek-web` | `ds-web` | DeepSeek Web | Web cookie | [link](https://chat.deepseek.com) | Paste your userToken from chat.deepseek.com — DevTools → Application → Local Storage → userToken | emulated |
 | `doubao-web` | `db` | Dola Web (ByteDance) | Web cookie | [link](https://www.dola.com) | Paste the full Cookie header from www.dola.com. It should include sessionid, ttwid, and s_v_web_id. If s_v_web_id is unavailable, fp=verify_... from a chat/completion request URL can be used as a fallback. | — |
diff --git a/open-sse/executors/copilot-m365-connection.ts b/open-sse/executors/copilot-m365-connection.ts
index 0c5303c250..d5f6d80c6c 100644
--- a/open-sse/executors/copilot-m365-connection.ts
+++ b/open-sse/executors/copilot-m365-connection.ts
@@ -160,7 +160,16 @@ export function resolveConnectionParams(
   const psd = (credentials?.providerSpecificData ?? {}) as JsonRecord;
   const parsedApiKey =
     typeof credentials?.apiKey === "string" ? parsePastedCredential(credentials.apiKey) : {};
+  // A JWT in credentials.accessToken (3 dot-separated parts — the individual-tier
+  // token is an opaque JWE with 5) is the freshest copy: the executor refreshes it
+  // in place before resolving params, and the framework mutates it after a refresh.
+  const credentialsJwt =
+    typeof credentials?.accessToken === "string" &&
+    credentials.accessToken.split(".").length === 3
+      ? credentials.accessToken
+      : "";
   const accessToken =
+    credentialsJwt ||
     parsedApiKey.accessToken ||
     (typeof credentials?.apiKey === "string" &&
       credentials.apiKey &&
@@ -254,6 +263,135 @@ export function redactWsUrl(wsUrl: string): string {
   return wsUrl.replace(/access_token=[^&]*/i, "access_token=REDACTED");
 }
 
+// ── OAuth refresh support (#10718 — client ids observed in the browser token
+// and M365-Copilot2API) ────────────────────────────────────────────────────
+//
+// The browser-issued access_token lives ~75 minutes. These helpers redeem a
+// stored refresh_token at the Microsoft identity platform (same public client
+// the m365.cloud.microsoft web app uses) so the connection self-heals instead
+// of requiring a fresh DevTools capture after every expiry.
+
+/** Public client id observed in both the browser token and M365-Copilot2API. */
+export const M365_OAUTH_CLIENT_ID = "c0ab8ce9-e9a0-42e7-b064-33d422df41f1";
+
+export const M365_OAUTH_SCOPE =
+  "openid profile offline_access https://substrate.office.com/sydney/M365Chat.Read " +
+  "https://substrate.office.com/sydney/sydney.readwrite";
+
+/** Refresh lead time — refresh when the current token has less than this left. */
+export const M365_REFRESH_LEAD_MS = 5 * 60 * 1000;
+
+type MinimalLog = {
+  info?: (tag: string, message: string) => void;
+  warn?: (tag: string, message: string) => void;
+};
+
+/** Decode a JWT payload WITHOUT verification — exp/tid are routing hints, never authz. */
+export function decodeJwtClaims(
+  token: string
+): { exp?: number; tid?: string; oid?: string } | null {
+  try {
+    const parts = token.split(".");
+    if (parts.length !== 3) return null;
+    const payload = JSON.parse(Buffer.from(parts[1], "base64url").toString("utf8"));
+    return payload && typeof payload === "object" ? payload : null;
+  } catch {
+    return null;
+  }
+}
+
+/** True when the token is unreadable, already expired, or inside the refresh lead window. */
+export function tokenNeedsRefresh(token: string, leadMs = M365_REFRESH_LEAD_MS): boolean {
+  const claims = decodeJwtClaims(token);
+  if (!claims?.exp) return true;
+  return claims.exp * 1000 <= Date.now() + leadMs;
+}
+
+/** The freshest readable access token for a connection (JWT column → apiKey → psd). */
+export function currentM365AccessToken(
+  credentials: ProviderCredentials | undefined
+): string {
+  if (
+    typeof credentials?.accessToken === "string" &&
+    credentials.accessToken.split(".").length === 3
+  ) {
+    return credentials.accessToken;
+  }
+  if (typeof credentials?.apiKey === "string") {
+    const parsed = parsePastedCredential(credentials.apiKey);
+    if (parsed.accessToken && parsed.accessToken.split(".").length === 3) return parsed.accessToken;
+    // Opaque (JWE) individual-tier token — still a usable credential, just not refreshable.
+    return parsed.accessToken || "";
+  }
+  const psd = (credentials?.providerSpecificData ?? {}) as JsonRecord;
+  if (typeof psd.accessToken === "string") return psd.accessToken;
+  if (typeof psd.access_token === "string") return psd.access_token;
+  return "";
+}
+
+/** The chathub path (`<user-oid>@<tenant-id>`) from wherever it is stored. */
+export function currentM365ChathubPath(credentials: ProviderCredentials | undefined): string {
+  const psd = (credentials?.providerSpecificData ?? {}) as JsonRecord;
+  return (
+    (typeof credentials?.apiKey === "string"
+      ? parsePastedCredential(credentials.apiKey).chathubPath
+      : "") ||
+    (typeof psd.chathubPath === "string" && psd.chathubPath) ||
+    (typeof psd.userTenant === "string" && psd.userTenant) ||
+    ""
+  );
+}
+
+export interface M365RefreshResult {
+  accessToken: string;
+  refreshToken?: string;
+  expiresIn?: number;
+}
+
+/**
+ * Redeem the refresh_token (public client — no secret). MS may rotate the
+ * refresh_token; callers MUST persist the returned one when present or the
+ * token family dies after the first refresh.
+ */
+export async function refreshM365AccessToken(
+  refreshToken: string,
+  tid: string,
+  log?: MinimalLog
+): Promise<M365RefreshResult | { error: string }> {
+  const endpoint = `https://login.microsoftonline.com/${tid || "common"}/oauth2/v2.0/token`;
+  try {
+    const res = await fetch(endpoint, {
+      method: "POST",
+      headers: {
+        "Content-Type": "application/x-www-form-urlencoded",
+        Accept: "application/json",
+      },
+      body: new URLSearchParams({
+        client_id: M365_OAUTH_CLIENT_ID,
+        grant_type: "refresh_token",
+        refresh_token: refreshToken,
+        scope: M365_OAUTH_SCOPE,
+      }),
+    });
+    const data = (await res.json().catch(() => ({}))) as Record<string, unknown>;
+    if (!res.ok || typeof data.access_token !== "string") {
+      const error = typeof data.error === "string" ? data.error : `HTTP ${res.status}`;
+      log?.warn?.("M365_TOKEN", `refresh_token grant failed: ${error}`);
+      return { error };
+    }
+    log?.info?.("M365_TOKEN", "access token refreshed via refresh_token grant");
+    return {
+      accessToken: data.access_token,
+      refreshToken: typeof data.refresh_token === "string" ? data.refresh_token : undefined,
+      expiresIn: typeof data.expires_in === "number" ? data.expires_in : undefined,
+    };
+  } catch (e) {
+    const error = e instanceof Error ? e.message : String(e);
+    log?.warn?.("M365_TOKEN", `refresh request failed: ${error}`);
+    return { error };
+  }
+}
+
 /** Flatten OpenAI messages into a single prompt (system instructions prepended). */
 export function buildPrompt(body: JsonRecord | undefined): string {
   const messages = (body?.messages as Array<JsonRecord>) || [];
diff --git a/open-sse/executors/copilot-m365-frames.ts b/open-sse/executors/copilot-m365-frames.ts
index add2716ee0..c8c6dee7be 100644
--- a/open-sse/executors/copilot-m365-frames.ts
+++ b/open-sse/executors/copilot-m365-frames.ts
@@ -11,7 +11,9 @@
  * Protocol (from @skyzea1's #4042 capture):
  *   - JSON messages terminated with the SignalR record separator `\x1e`.
  *   - Handshake: → {"protocol":"json","version":1}  ← {}  → {"type":6}
- *   - Send: type:4 invocation to target "chat" with arguments[0] = { message, ... }
+ *   - Send: type:4 invocation to target "chat" with arguments[0] = { message, ... },
+ *     immediately followed by a type:1 target:"Metrics" frame in the SAME socket
+ *     write (#10718 — an invocation without its Metrics pair is silently dropped).
  *   - Stream: type:1 target:"update" deltas (bot text at arguments[0].messages[].text,
  *     accumulated — NOT incremental) → isLastUpdate:true → type:2 final → type:3 completion.
  */
@@ -25,19 +27,18 @@ export const HANDSHAKE_REQUEST = { protocol: "json", version: 1 } as const;
 /** SignalR keepalive ping frame. */
 export const KEEPALIVE_PING = { type: 6 } as const;
 
-/** Allowed message types observed in the individual M365 send frame. */
+/**
+ * Allowed message types observed in the 2026-08 recapture of the working
+ * `m365.cloud.microsoft/chat` client (#10718). The old 11-entry list is no longer
+ * seen on the wire — the stale shape gets closed immediately after the type:4.
+ */
 export const ALLOWED_MESSAGE_TYPES = [
   "Chat",
   "Suggestion",
-  "InternalSearchQuery",
   "Disengaged",
-  "InternalLoaderMessage",
   "Progress",
-  "GeneratedCode",
-  "RenderCardRequest",
-  "AdsQuery",
-  "SemanticSerp",
-  "GenerateContentQuery",
+  "EndOfRequest",
+  "InternalLoaderMessage",
 ] as const;
 
 /**
@@ -74,22 +75,20 @@ export const M365_ENTERPRISE_EXTRA_MESSAGE_TYPES = [
   "SwitchRespondingEndpoint",
 ] as const;
 
+/**
+ * Individual / EDU option sets from the 2026-08 recapture (#10718) — 14 entries.
+ * The previous 25-entry consumer/MSA set (enable_msa_user, pdnascan, cwc_code_*,
+ * …) is no longer observed on the wire and belongs to the shape the substrate
+ * now drops silently.
+ */
 export const M365_DEFAULT_OPTION_SETS = [
   "search_result_progress_messages_with_search_queries",
   "update_textdoc_response_after_streaming",
   "deepleo_networking_timeout_10minutes_canmore",
   "cwc_flux_image",
-  "cwc_code_interpreter",
-  "cwc_code_interpreter_amsfix",
-  "enable_msa_user",
-  "cwcgptv",
+  "cwcfluxgptv",
   "flux_v3_gptv_enable_upload_multi_image_in_turn_wo_ch",
   "gptvnorm2048",
-  "pdnascan",
-  "cwc_code_interpreter_citation_fix",
-  "code_interpreter_interactive_charts",
-  "cwc_code_interpreter_interactive_charts_inline_image",
-  "code_interpreter_matplotlib_patching",
   "cwc_fileupload_odb",
   "update_memory_plugin",
   "add_custom_instructions",
@@ -97,9 +96,6 @@ export const M365_DEFAULT_OPTION_SETS = [
   "flux_v3_progress_messages",
   "enable_batch_token_processing",
   "enable_gg_gpt",
-  "flux_v3_image_gen_enable_non_watermarked_storage",
-  "flux_v3_image_gen_enable_story",
-  "rich_responses",
 ] as const;
 
 /** Append the record separator to a JSON-serializable frame. */
@@ -117,6 +113,32 @@ export function keepaliveFrame(): string {
   return encodeFrame(KEEPALIVE_PING);
 }
 
+/**
+ * #10718 — the browser follows the type:4 chat invocation with this type:1
+ * target:"Metrics" frame in the SAME socket write. Sending the invocation alone
+ * gets it silently ignored (no update frames at all), so the executor must
+ * concatenate `metricsFrame()` onto the invocation payload.
+ */
+export const CHAT_METRICS_FRAME = {
+  arguments: [
+    {
+      Timestamps: {
+        ConnectionEstablished: "",
+        ConnectionStart: "",
+        UserInputStart: "",
+        UserInputSubmit: "",
+      },
+    },
+  ],
+  target: "Metrics",
+  type: 1,
+} as const;
+
+/** Serialized Metrics follow-up frame (see {@link CHAT_METRICS_FRAME}). */
+export function metricsFrame(): string {
+  return encodeFrame(CHAT_METRICS_FRAME);
+}
+
 /**
  * Split a raw socket buffer into complete `\x1e`-terminated frames, returning any
  * trailing partial frame as `rest` so it can be prepended to the next chunk.
@@ -155,22 +177,37 @@ export function handshakeError(frame: Record<string, unknown> | null): string |
 
 export interface ChatInvocationOptions {
   text: string;
-  /** Per-connection trace id (hex), reused as clientCorrelationId/traceId. */
+  /** Per-invocation trace id (GUID). */
   traceId: string;
-  /** Per-session id (GUID). */
+  /** Client correlation id; defaults to {@link ChatInvocationOptions.traceId}. */
+  clientCorrelationId?: string;
+  /** Per-session id (GUID, == the WS URL X-SessionId query). */
   sessionId: string;
+  /** Per-request id (== the WS URL chatsessionid/clientrequestid query). */
+  requestId: string;
+  /**
+   * Conversation id — MUST match the ConversationId query of the WS URL the
+   * invocation rides on (#10718: the server cross-checks the two).
+   */
+  conversationId: string;
+  /** BCP-47 locale echoed in message.locale; defaults to "en-us". */
+  locale?: string;
+  /** IANA time zone for message.locationInfo; defaults to "UTC". */
+  timeZone?: string;
+  /** Hour offset for message.locationInfo; defaults to 0. */
+  timeZoneOffset?: number;
   /** Whether this is the first turn of the conversation. */
   isStartOfSession?: boolean;
-  /** Tier-specific option flags; left empty by default (tuned during live validation). */
+  /** Tier-specific option flags; defaults to {@link M365_DEFAULT_OPTION_SETS}. */
   optionsSets?: string[];
   tone?: string;
   /** Tier-specific allowed message types; defaults to {@link ALLOWED_MESSAGE_TYPES}. */
   allowedMessageTypes?: readonly string[];
   /**
-   * Tier-specific disconnect behavior sent in every type:4 chat invocation. The work
-   * Surface rejects any value other than exactly "continue" (#8971). Defaults to ""
-   * for individual/consumer/EDU tiers; {@link resolveChatInvocationOverrides} returns
-   * "continue" for the enterprise tier.
+   * Tier-specific disconnect behavior sent in the type:4 chat invocation. The work
+   * surface rejects any value other than exactly "continue" (#8971), so the
+   * enterprise tier sends it; the 2026-08 recapture shows the individual/EDU
+   * surface omits the key entirely, so it is left out unless set (#10718).
    */
   disconnectBehavior?: string;
 }
@@ -185,7 +222,7 @@ export function resolveChatInvocationOverrides(tier: string | undefined): {
   optionsSets: string[];
   tone: string;
   allowedMessageTypes: readonly string[];
-  disconnectBehavior: string;
+  disconnectBehavior: string | undefined;
 } {
   if (tier === "enterprise") {
     return {
@@ -197,9 +234,12 @@ export function resolveChatInvocationOverrides(tier: string | undefined): {
   }
   return {
     optionsSets: [...M365_DEFAULT_OPTION_SETS],
-    tone: "",
+    // #10718 — the 2026-08 recapture sends tone:"magic" (lowercase) on the
+    // individual/EDU surface; the old "" default is part of the dropped shape.
+    tone: "magic",
     allowedMessageTypes: ALLOWED_MESSAGE_TYPES,
-    disconnectBehavior: "",
+    // Omitted entirely on the individual/EDU wire (see ChatInvocationOptions).
+    disconnectBehavior: undefined,
   };
 }
 
@@ -207,7 +247,7 @@ export function resolveChatInvocationOverrides(tier: string | undefined): {
  * BizChat exposes several models selected by the `tone` field of the `type:4` chat
  * invocation (#7872, values confirmed against a real enterprise tenant in #7850). Each
  * tone-selected variant is registered as its own model id; the bare `copilot-m365` id is
- * intentionally absent here so it keeps the tier default tone (`Magic` on enterprise, `""`
+ * intentionally absent here so it keeps the tier default tone (`Magic` on enterprise, `magic`
  * otherwise) resolved by {@link resolveChatInvocationOverrides}.
  */
 export const M365_MODEL_TONE_MAP: Readonly<Record<string, string>> = {
@@ -228,7 +268,14 @@ export function resolveToneForModel(model: string | undefined): string | undefin
 
 /**
  * Build the `type:4` chat invocation frame body (not yet `\x1e`-terminated).
- * Mirrors the argument shape captured on the individual M365 path in #4042.
+ * Mirrors the argument shape recaptured from a working `m365.cloud.microsoft/chat`
+ * client in 2026-08 (#10718). Notable differences from the pre-#10718 shape: a
+ * populated `clientInfo` + `productThreadType:"Office"`, a `conversationId`
+ * matching the WS URL query, a rich `message` object, and no
+ * `spokenTextMode` / `extraExtensionParameters` / `isSbsSupported` /
+ * `renderReferencesBehindEOS` / `disconnectBehavior` — none of those are still
+ * observed on the wire, and the stale shape gets closed immediately after the
+ * invocation.
  */
 export function buildChatInvocation(opts: ChatInvocationOptions): Record<string, unknown> {
   return {
@@ -237,33 +284,48 @@ export function buildChatInvocation(opts: ChatInvocationOptions): Record<string,
     invocationId: "0",
     arguments: [
       {
-        source: "officeweb",
-        clientCorrelationId: opts.traceId,
-        sessionId: opts.sessionId,
-        optionsSets: opts.optionsSets ?? [...M365_DEFAULT_OPTION_SETS],
-        streamingMode: "ConciseWithPadding",
-        spokenTextMode: "None",
-        options: {},
-        extraExtensionParameters: {},
         allowedMessageTypes: opts.allowedMessageTypes
           ? [...opts.allowedMessageTypes]
           : [...ALLOWED_MESSAGE_TYPES],
-        sliceIds: [],
-        threadLevelGptId: {},
-        traceId: opts.traceId,
-        isStartOfSession: opts.isStartOfSession ?? true,
-        clientInfo: {},
-        message: {
-          author: "user",
-          inputMethod: "Keyboard",
-          text: opts.text,
-          messageType: "Chat",
+        clientCorrelationId: opts.clientCorrelationId ?? opts.traceId,
+        clientInfo: {
+          clientAppName: "Office",
+          clientPlatform: "mcmcopilot-web",
         },
+        conversationId: opts.conversationId,
+        isStartOfSession: opts.isStartOfSession ?? true,
+        message: {
+          adaptiveCards: [],
+          attachments: null,
+          author: "user",
+          clientPreferences: {},
+          entityAnnotationTypes: ["People", "File", "Event", "Email", "TeamsMessage"],
+          experienceType: "Default",
+          inputMethod: "Keyboard",
+          locale: opts.locale ?? "en-us",
+          locationInfo: {
+            timeZone: opts.timeZone ?? "UTC",
+            timeZoneOffset: opts.timeZoneOffset ?? 0,
+          },
+          messageType: "Chat",
+          requestId: opts.requestId,
+          text: opts.text,
+        },
+        options: {},
+        optionsSets: opts.optionsSets ?? [...M365_DEFAULT_OPTION_SETS],
         plugins: [],
-        isSbsSupported: false,
-        tone: opts.tone ?? "",
-        renderReferencesBehindEOS: true,
-        disconnectBehavior: opts.disconnectBehavior ?? "",
+        productThreadType: "Office",
+        sessionId: opts.sessionId,
+        sliceIds: [],
+        source: "officeweb",
+        streamingMode: "ConciseWithPadding",
+        threadLevelGptId: {},
+        tone: opts.tone ?? "magic",
+        toolChoice: null,
+        traceId: opts.traceId,
+        // #8971 keeps "continue" for the enterprise tier; the individual/EDU wire
+        // omits the key, so only include it when actually set (#10718).
+        ...(opts.disconnectBehavior ? { disconnectBehavior: opts.disconnectBehavior } : {}),
       },
     ],
   };
diff --git a/open-sse/executors/copilot-m365-web.ts b/open-sse/executors/copilot-m365-web.ts
index 7e85c43e84..57f854ef86 100644
--- a/open-sse/executors/copilot-m365-web.ts
+++ b/open-sse/executors/copilot-m365-web.ts
@@ -5,8 +5,13 @@ import { BaseExecutor, type ExecuteInput, type ExecutorLog } from "./base.ts";
 import {
   buildPrompt,
   buildWsUrl,
+  currentM365AccessToken,
+  currentM365ChathubPath,
+  decodeJwtClaims,
   redactWsUrl,
+  refreshM365AccessToken,
   resolveConnectionParams,
+  tokenNeedsRefresh,
 } from "./copilot-m365-connection.ts";
 import {
   accumulateBotContent,
@@ -17,7 +22,7 @@ import {
   handshakeFrame,
   isCompletionFrame,
   isUpdateFrame,
-  keepaliveFrame,
+  metricsFrame,
   parseFrame,
   resolveChatInvocationOverrides,
   resolveToneForModel,
@@ -152,8 +157,17 @@ export class CopilotM365WebExecutor extends BaseExecutor {
 
           try {
             const wsUrlParts = new URL(input.wsUrl);
-            const traceId = wsUrlParts.searchParams.get("clientrequestid") ?? crypto.randomUUID().replace(/-/g, "");
+            // #10718 — the invocation must echo the ids riding in the WS URL query
+            // (conversationId is cross-checked server-side). traceId is a fresh GUID
+            // per turn, as in the browser capture.
+            const requestId =
+              wsUrlParts.searchParams.get("chatsessionid") ??
+              wsUrlParts.searchParams.get("clientrequestid") ??
+              crypto.randomUUID();
             const sessionId = wsUrlParts.searchParams.get("X-SessionId") ?? crypto.randomUUID();
+            const conversationId =
+              wsUrlParts.searchParams.get("ConversationId") ?? crypto.randomUUID();
+            const traceId = crypto.randomUUID();
 
             log?.debug?.("M365_WS", `connecting → ${redactWsUrl(input.wsUrl)}`);
 
@@ -166,23 +180,26 @@ export class CopilotM365WebExecutor extends BaseExecutor {
             });
 
             const sendChat = () => {
-              ws?.send(keepaliveFrame());
               const overrides = resolveChatInvocationOverrides(input.tier);
               // Model-driven tone (#7872) wins over the tier default; a bare/unknown id
               // keeps the tier tone resolved above.
               const tone = resolveToneForModel(input.model) ?? overrides.tone;
-              ws?.send(
-                encodeFrame(
-                  buildChatInvocation({
-                    text: input.prompt,
-                    traceId,
-                    sessionId,
-                    isStartOfSession: true,
-                    ...overrides,
-                    tone,
-                  })
-                )
+              const invocationFrame = encodeFrame(
+                buildChatInvocation({
+                  text: input.prompt,
+                  traceId,
+                  sessionId,
+                  requestId,
+                  conversationId,
+                  isStartOfSession: true,
+                  ...overrides,
+                  tone,
+                })
               );
+              // #10718 — the invocation and its type:1 Metrics follow-up must land
+              // in ONE socket write, exactly as the browser sends them; a bare
+              // invocation (or one preceded by a type:6 ping) is silently dropped.
+              ws?.send(invocationFrame + metricsFrame());
             };
 
             ws.on("open", () => {
@@ -273,6 +290,61 @@ export class CopilotM365WebExecutor extends BaseExecutor {
     );
   }
 
+  /**
+   * #10718 — proactively refresh the M365 access token before opening the WS.
+   * A WS-handshake 401 surfaces as an error event INSIDE the SSE stream (the HTTP
+   * response is already 200 by then), so chatCore's generic 401→refresh→retry
+   * orchestration never triggers — the refresh has to happen here, pre-flight.
+   * No-ops for legacy connections without a stored refresh_token.
+   */
+  private async ensureFreshCredentials(
+    credentials: ExecuteInput["credentials"],
+    onCredentialsRefreshed: ExecuteInput["onCredentialsRefreshed"],
+    log: ExecutorLog | null
+  ): Promise<void> {
+    const psd = (credentials?.providerSpecificData ?? {}) as JsonRecord;
+    const refreshToken =
+      credentials.refreshToken || (typeof psd.refreshToken === "string" ? psd.refreshToken : "");
+    if (!refreshToken) return;
+
+    const current = currentM365AccessToken(credentials);
+    if (current && !tokenNeedsRefresh(current)) return;
+
+    const tid =
+      decodeJwtClaims(current)?.tid || (typeof psd.tid === "string" ? psd.tid : "") || "";
+    const result = await refreshM365AccessToken(refreshToken, tid, log ?? undefined);
+    if ("error" in result) {
+      // Fall through with the existing token — the WS layer will surface the failure.
+      return;
+    }
+
+    const rotated = result.refreshToken || refreshToken;
+    const chathubPath = currentM365ChathubPath(credentials);
+    const next = {
+      ...credentials,
+      accessToken: result.accessToken,
+      refreshToken: rotated,
+      // Keep the pasted-format apiKey self-consistent so every resolution path
+      // (fresh column, stale column, dashboard re-read) sees the same token.
+      ...(chathubPath
+        ? { apiKey: `access_token=${result.accessToken}; chathubPath=${chathubPath}` }
+        : {}),
+      ...(result.expiresIn
+        ? { expiresAt: new Date(Date.now() + result.expiresIn * 1000).toISOString() }
+        : {}),
+    };
+    Object.assign(credentials, next);
+    try {
+      await onCredentialsRefreshed?.(next);
+    } catch (err) {
+      // #7676 pattern: a persistence failure must never fail the user-facing response.
+      log?.warn?.(
+        "M365_TOKEN",
+        `persisting refreshed token failed (${err instanceof Error ? err.message : String(err)}) — will re-refresh next request`
+      );
+    }
+  }
+
   async execute(input: ExecuteInput): Promise<{
     response: Response;
     url: string;
@@ -293,6 +365,12 @@ export class CopilotM365WebExecutor extends BaseExecutor {
       };
     }
 
+    await this.ensureFreshCredentials(
+      input.credentials,
+      input.onCredentialsRefreshed,
+      input.log ?? null
+    );
+
     const connectionParams = resolveConnectionParams(input.credentials);
     if ("error" in connectionParams) {
       return {
diff --git a/src/shared/constants/providers/web-cookie.ts b/src/shared/constants/providers/web-cookie.ts
index e01fa95190..6d1b08be7d 100644
--- a/src/shared/constants/providers/web-cookie.ts
+++ b/src/shared/constants/providers/web-cookie.ts
@@ -152,7 +152,7 @@ export const WEB_COOKIE_PROVIDERS = {
     textIcon: "M365",
     website: "https://m365.cloud.microsoft/chat",
     authHint:
-      "Sign in at m365.cloud.microsoft/chat, then open DevTools → Network → filter 'WS' → click the Chathub WebSocket connection. Copy both the access_token query parameter AND the account-specific Chathub path segment from its request URL (wss://…/Chathub/<path>?…&access_token=…). It is NOT an Authorization: Bearer header on an XHR/Fetch request. The token is short-lived; this is an unofficial integration.",
+      "Sign in at m365.cloud.microsoft/chat, then open DevTools → Network → filter 'WS' → click the Chathub WebSocket connection. Copy both the access_token query parameter AND the account-specific Chathub path segment from its request URL (wss://…/Chathub/<path>?…&access_token=…). It is NOT an Authorization: Bearer header on an XHR/Fetch request. The token is short-lived; this is an unofficial integration. Optional: store a refresh_token in providerSpecificData.refreshToken (any Microsoft device-code/refresh flow for the substrate.office.com/sydney scopes) and OmniRoute pre-flight-refreshes the access token itself — otherwise re-capture after every ~75 min expiry.",
     subscriptionRisk: true,
     riskNoticeVariant: "webCookie",
   },
diff --git a/tests/unit/copilot-m365-enterprise-invocation-7870.test.ts b/tests/unit/copilot-m365-enterprise-invocation-7870.test.ts
index f95cd12df3..98a3548dfe 100644
--- a/tests/unit/copilot-m365-enterprise-invocation-7870.test.ts
+++ b/tests/unit/copilot-m365-enterprise-invocation-7870.test.ts
@@ -29,12 +29,24 @@ class MockM365WebSocket {
 
   send(data: string): void {
     this.sent.push(String(data));
-    const parsed = JSON.parse(String(data).replace(/\x1e$/, ""));
-    if (parsed.protocol === "json") {
+    // #10718 — a single socket write may carry multiple \x1e-terminated frames
+    // (the chat invocation and its Metrics follow-up ride together).
+    const parsedFrames = String(data)
+      .split("\x1e")
+      .filter((f) => f.length > 0)
+      .map((f) => {
+        try {
+          return JSON.parse(f);
+        } catch {
+          return null;
+        }
+      });
+    const parsed = parsedFrames.find((f) => f && f.protocol === "json") ?? parsedFrames[0];
+    if (parsed?.protocol === "json") {
       queueMicrotask(() => this.emit("message", Buffer.from(encodeFrame({}))));
       return;
     }
-    if (parsed.type === 4 && parsed.target === "chat") {
+    if (parsedFrames.some((f) => f?.type === 4 && f?.target === "chat")) {
       queueMicrotask(() => {
         this.emit(
           "message",
@@ -83,7 +95,7 @@ async function sendChatInvocation(tier: string | undefined) {
     assert.equal(MockM365WebSocket.instances.length, 1);
     const sentFrames = MockM365WebSocket.instances[0].sent;
     const chatFrameRaw = sentFrames
-      .map((f) => f.replace(/\x1e$/, ""))
+      .flatMap((f) => f.split("\x1e").filter((frame) => frame.length > 0))
       .map((f) => {
         try {
           return JSON.parse(f);
@@ -132,31 +144,30 @@ test("#7870: enterprise-tier chat invocation defaults tone to Magic", async () =
   assert.equal(invocationArgs.tone, "Magic");
 });
 
-test("#7870: individual (no tier) chat invocation payload stays byte-identical to today", async () => {
+test("#10718: individual (no tier) chat invocation carries the recaptured 2026-08 shape", async () => {
   const invocationArgs = await sendChatInvocation(undefined);
   const optionsSets = invocationArgs.optionsSets as string[];
-  assert.ok(optionsSets.includes("enable_msa_user"));
-  assert.equal(invocationArgs.tone, "");
+  // The 25-entry consumer/MSA set (enable_msa_user, pdnascan, …) is gone from
+  // the wire — the stale set was part of the silently-dropped shape.
+  assert.ok(!optionsSets.includes("enable_msa_user"));
+  assert.ok(optionsSets.includes("enable_gg_gpt"));
+  // The browser sends tone:"magic" (lowercase) on the individual/EDU surface.
+  assert.equal(invocationArgs.tone, "magic");
   assert.deepEqual(invocationArgs.allowedMessageTypes, [
     "Chat",
     "Suggestion",
-    "InternalSearchQuery",
     "Disengaged",
-    "InternalLoaderMessage",
     "Progress",
-    "GeneratedCode",
-    "RenderCardRequest",
-    "AdsQuery",
-    "SemanticSerp",
-    "GenerateContentQuery",
+    "EndOfRequest",
+    "InternalLoaderMessage",
   ]);
 });
 
-test("#7870: EDU-tier chat invocation payload stays byte-identical to today (unaffected by enterprise change)", async () => {
+test("#10718: EDU-tier chat invocation carries the same recaptured shape", async () => {
   const invocationArgs = await sendChatInvocation("edu");
   const optionsSets = invocationArgs.optionsSets as string[];
-  assert.ok(optionsSets.includes("enable_msa_user"));
-  assert.equal(invocationArgs.tone, "");
+  assert.ok(!optionsSets.includes("enable_msa_user"));
+  assert.equal(invocationArgs.tone, "magic");
 });
 
 test("#8971: enterprise-tier chat invocation must send disconnectBehavior=continue", async () => {
@@ -168,11 +179,11 @@ test("#8971: enterprise-tier chat invocation must send disconnectBehavior=contin
   );
 });
 
-test("#8971: individual (no tier) chat invocation disconnectBehavior remains empty (byte-identical to #4042)", async () => {
+test("#8971/#10718: individual (no tier) chat invocation omits disconnectBehavior (not on the 2026-08 wire)", async () => {
   const invocationArgs = await sendChatInvocation(undefined);
   assert.equal(
     invocationArgs.disconnectBehavior,
-    "",
-    `individual-tier invocation must carry disconnectBehavior=""; got ${JSON.stringify(invocationArgs.disconnectBehavior)}`
+    undefined,
+    `individual-tier invocation must omit disconnectBehavior; got ${JSON.stringify(invocationArgs.disconnectBehavior)}`
   );
 });
diff --git a/tests/unit/copilot-m365-invocation-refresh-10718.test.ts b/tests/unit/copilot-m365-invocation-refresh-10718.test.ts
new file mode 100644
index 0000000000..f5e602ce3d
--- /dev/null
+++ b/tests/unit/copilot-m365-invocation-refresh-10718.test.ts
@@ -0,0 +1,205 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+
+// #10718 — the substrate started dropping the old type:4 chat invocation shape
+// (immediate bare type:3 close, "(empty response)" on every request). A fresh
+// TLS-MITM capture of a working m365.cloud.microsoft/chat round-trip (2026-08)
+// showed a materially different argument shape AND a type:1 target:"Metrics"
+// frame written in the SAME socket write right after the invocation — an
+// invocation without its Metrics pair is silently ignored.
+//
+// These tests pin the recaptured wire shape and the refresh_token pre-flight
+// (the browser-issued access_token lives ~75 min with no refresh path before
+// this). Live round-trip on a real EDU (A3/Starter) tenant is the separate
+// Rule #18 validation gate.
+
+import {
+  RECORD_SEPARATOR,
+  metricsFrame,
+  buildChatInvocation,
+  resolveChatInvocationOverrides,
+  M365_DEFAULT_OPTION_SETS,
+  ALLOWED_MESSAGE_TYPES,
+} from "../../open-sse/executors/copilot-m365-frames.ts";
+import {
+  decodeJwtClaims,
+  tokenNeedsRefresh,
+  refreshM365AccessToken,
+  M365_OAUTH_CLIENT_ID,
+  M365_REFRESH_LEAD_MS,
+} from "../../open-sse/executors/copilot-m365-connection.ts";
+
+// ── Metrics follow-up frame ────────────────────────────────────────────────
+
+test("#10718: metricsFrame emits the exact bytes observed in the browser capture", () => {
+  assert.equal(
+    metricsFrame(),
+    '{"arguments":[{"Timestamps":{"ConnectionEstablished":"","ConnectionStart":"","UserInputStart":"","UserInputSubmit":""}}],"target":"Metrics","type":1}' +
+      RECORD_SEPARATOR
+  );
+});
+
+// ── Recaptured invocation shape ────────────────────────────────────────────
+
+test("#10718: buildChatInvocation matches the recaptured arguments[0] key set", () => {
+  const arg = buildChatInvocation({
+    text: "Say OK in one word.",
+    traceId: "11111111-1111-1111-1111-111111111111",
+    sessionId: "22222222-2222-2222-2222-222222222222",
+    requestId: "33333333-3333-3333-3333-333333333333",
+    conversationId: "44444444-4444-4444-4444-444444444444",
+  }).arguments[0] as Record<string, unknown>;
+
+  // Exact key set from the capture — additions AND omissions are both pinned,
+  // because the stale keys are exactly what got the shape dropped.
+  assert.deepEqual(Object.keys(arg).sort(), [
+    "allowedMessageTypes",
+    "clientCorrelationId",
+    "clientInfo",
+    "conversationId",
+    "isStartOfSession",
+    "message",
+    "options",
+    "optionsSets",
+    "plugins",
+    "productThreadType",
+    "sessionId",
+    "sliceIds",
+    "source",
+    "streamingMode",
+    "threadLevelGptId",
+    "tone",
+    "toolChoice",
+    "traceId",
+  ]);
+  assert.equal(arg.productThreadType, "Office");
+  assert.deepEqual(arg.clientInfo, { clientAppName: "Office", clientPlatform: "mcmcopilot-web" });
+  assert.equal(arg.conversationId, "44444444-4444-4444-4444-444444444444");
+  assert.equal(arg.toolChoice, null);
+  assert.equal(arg.tone, "magic");
+});
+
+test("#10718: the message object carries the recaptured rich shape", () => {
+  const arg = buildChatInvocation({
+    text: "Say OK in one word.",
+    traceId: "t",
+    sessionId: "s",
+    requestId: "r",
+    conversationId: "c",
+  }).arguments[0] as Record<string, unknown>;
+  const message = arg.message as Record<string, unknown>;
+
+  assert.deepEqual(Object.keys(message).sort(), [
+    "adaptiveCards",
+    "attachments",
+    "author",
+    "clientPreferences",
+    "entityAnnotationTypes",
+    "experienceType",
+    "inputMethod",
+    "locale",
+    "locationInfo",
+    "messageType",
+    "requestId",
+    "text",
+  ]);
+  assert.equal(message.author, "user");
+  assert.equal(message.messageType, "Chat");
+  assert.equal(message.requestId, "r");
+  assert.equal(message.experienceType, "Default");
+  assert.deepEqual(message.entityAnnotationTypes, ["People", "File", "Event", "Email", "TeamsMessage"]);
+  assert.equal(message.attachments, null);
+  assert.deepEqual(message.locationInfo, { timeZone: "UTC", timeZoneOffset: 0 });
+});
+
+test("#10718: default tier lists are the recaptured 14-entry optionsSets / 6-entry allowedMessageTypes", () => {
+  const overrides = resolveChatInvocationOverrides(undefined);
+  assert.equal(overrides.optionsSets.length, 14);
+  assert.equal(overrides.allowedMessageTypes.length, 6);
+  assert.equal(overrides.tone, "magic");
+  // The pre-#10718 consumer/MSA flags are gone from the wire.
+  const optionSets = M365_DEFAULT_OPTION_SETS as readonly string[];
+  const messageTypes = ALLOWED_MESSAGE_TYPES as readonly string[];
+  for (const stale of ["enable_msa_user", "pdnascan", "cwc_code_interpreter", "rich_responses"]) {
+    assert.ok(!optionSets.includes(stale), `${stale} must not be in the default option sets`);
+  }
+  for (const stale of ["InternalSearchQuery", "GeneratedCode", "RenderCardRequest", "AdsQuery", "SemanticSerp", "GenerateContentQuery"]) {
+    assert.ok(!messageTypes.includes(stale), `${stale} must not be in allowedMessageTypes`);
+  }
+  // Entries the capture showed and the old lists lacked.
+  assert.ok(optionSets.includes("cwcfluxgptv"));
+  assert.ok(messageTypes.includes("EndOfRequest"));
+});
+
+// ── refresh_token helpers ──────────────────────────────────────────────────
+
+function fakeJwt(claims: Record<string, unknown>): string {
+  const b64 = (value: unknown) =>
+    Buffer.from(JSON.stringify(value)).toString("base64url");
+  return `${b64({ alg: "none" })}.${b64(claims)}.sig`;
+}
+
+test("#10718: decodeJwtClaims reads exp/tid without verification; non-JWT returns null", () => {
+  const claims = decodeJwtClaims(fakeJwt({ exp: 123, tid: "tenant-id", oid: "oid" }));
+  assert.equal(claims?.exp, 123);
+  assert.equal(claims?.tid, "tenant-id");
+  assert.equal(decodeJwtClaims("not.a-jwt"), null);
+  assert.equal(decodeJwtClaims("opaque-jwe-token.with.five.parts.here.and-more"), null);
+});
+
+test("#10718: tokenNeedsRefresh — unreadable/expired/inside-lead needs refresh, fresh does not", () => {
+  const now = Math.floor(Date.now() / 1000);
+  assert.equal(tokenNeedsRefresh("opaque"), true);
+  assert.equal(tokenNeedsRefresh(fakeJwt({ exp: now - 60 })), true);
+  // Inside the 5-minute lead window.
+  assert.equal(tokenNeedsRefresh(fakeJwt({ exp: now + M365_REFRESH_LEAD_MS / 1000 - 30 })), true);
+  assert.equal(tokenNeedsRefresh(fakeJwt({ exp: now + 3600 })), false);
+});
+
+test("#10718: refreshM365AccessToken redeems the public client grant and returns rotated tokens", async () => {
+  const originalFetch = globalThis.fetch;
+  let capturedUrl = "";
+  let capturedBody = "";
+  globalThis.fetch = (async (url: unknown, init?: RequestInit) => {
+    capturedUrl = String(url);
+    capturedBody = String(init?.body);
+    return new Response(
+      JSON.stringify({
+        access_token: "NEW-ACCESS",
+        refresh_token: "ROTATED-REFRESH",
+        expires_in: 4777,
+      }),
+      { status: 200 }
+    );
+  }) as typeof fetch;
+  try {
+    const result = await refreshM365AccessToken("OLD-REFRESH", "tenant-id");
+    assert.ok("accessToken" in result);
+    assert.equal(result.accessToken, "NEW-ACCESS");
+    assert.equal(result.refreshToken, "ROTATED-REFRESH");
+    assert.equal(result.expiresIn, 4777);
+    assert.match(capturedUrl, /login\.microsoftonline\.com\/tenant-id\/oauth2\/v2\.0\/token/);
+    assert.match(capturedBody, /grant_type=refresh_token/);
+    assert.match(capturedBody, new RegExp(`client_id=${M365_OAUTH_CLIENT_ID}`));
+    assert.match(capturedBody, /refresh_token=OLD-REFRESH/);
+  } finally {
+    globalThis.fetch = originalFetch;
+  }
+});
+
+test("#10718: refreshM365AccessToken surfaces AAD errors and network failures as {error}", async () => {
+  const originalFetch = globalThis.fetch;
+  globalThis.fetch = (async () =>
+    new Response(JSON.stringify({ error: "invalid_grant", error_description: "AADSTS700082" }), {
+      status: 400,
+    })) as typeof fetch;
+  const aadError = await refreshM365AccessToken("STALE");
+  assert.deepEqual(aadError, { error: "invalid_grant" });
+
+  globalThis.fetch = (async () => {
+    throw new Error("ENOTFOUND");
+  }) as typeof fetch;
+  const netError = await refreshM365AccessToken("ANY");
+  assert.deepEqual(netError, { error: "ENOTFOUND" });
+  globalThis.fetch = originalFetch;
+});
diff --git a/tests/unit/copilot-m365-web-executor.test.ts b/tests/unit/copilot-m365-web-executor.test.ts
index 3150082cb1..f6e48e488e 100644
--- a/tests/unit/copilot-m365-web-executor.test.ts
+++ b/tests/unit/copilot-m365-web-executor.test.ts
@@ -40,12 +40,24 @@ class MockM365WebSocket {
 
   send(data: string): void {
     this.sent.push(String(data));
-    const parsed = JSON.parse(String(data).replace(/\x1e$/, ""));
-    if (parsed.protocol === "json") {
+    // #10718 — a single socket write may carry multiple \x1e-terminated frames
+    // (the chat invocation and its Metrics follow-up ride together).
+    const parsedFrames = String(data)
+      .split("\x1e")
+      .filter((f) => f.length > 0)
+      .map((f) => {
+        try {
+          return JSON.parse(f);
+        } catch {
+          return null;
+        }
+      });
+    const parsed = parsedFrames.find((f) => f && f.protocol === "json") ?? parsedFrames[0];
+    if (parsed?.protocol === "json") {
       queueMicrotask(() => this.emit("message", Buffer.from(encodeFrame({}))));
       return;
     }
-    if (parsed.type === 4 && parsed.target === "chat") {
+    if (parsedFrames.some((f) => f?.type === 4 && f?.target === "chat")) {
       queueMicrotask(() => {
         this.emit(
           "message",
@@ -116,10 +128,18 @@ test("CopilotM365WebExecutor streams OpenAI SSE chunks from accumulated M365 upd
     assert.doesNotMatch(result.url, /redacted-token/);
     assert.equal(MockM365WebSocket.instances.length, 1);
 
-    const sent = MockM365WebSocket.instances[0].sent.join("\n");
-    assert.match(sent, /"protocol":"json"/);
-    assert.match(sent, /"type":6/);
-    assert.match(sent, /"target":"chat"/);
+    const sent = MockM365WebSocket.instances[0].sent;
+    const sentFrames = sent.flatMap((f) => f.split("\x1e").filter((frame) => frame.length > 0));
+    assert.ok(sentFrames.some((f) => f.includes('"protocol":"json"')));
+    // #10718 — the chat invocation and its type:1 Metrics follow-up ride in ONE
+    // socket write, and no type:6 keepalive is sent before them.
+    const invocationWrite = sent.find((f) => f.includes('"target":"chat"'));
+    assert.ok(invocationWrite, "expected a chat invocation write");
+    assert.match(invocationWrite, /"target":"Metrics"/);
+    assert.ok(
+      !sentFrames.some((f) => f === '{"type":6}'),
+      "the leading keepalive ping was removed (#10718): it must not precede the invocation"
+    );
 
     const dataLines = body
       .split("\n")
diff --git a/tests/unit/m365-bizchat-frames-4042.test.ts b/tests/unit/m365-bizchat-frames-4042.test.ts
index b1179d098a..cd67a0e42b 100644
--- a/tests/unit/m365-bizchat-frames-4042.test.ts
+++ b/tests/unit/m365-bizchat-frames-4042.test.ts
@@ -116,6 +116,8 @@ test("buildChatInvocation produces a type:4 chat invocation carrying the user te
     text: "protocol capture test. Reply with one word: pong.",
     traceId: "trace-id",
     sessionId: "session-id",
+    requestId: "request-id",
+    conversationId: "conversation-id",
     isStartOfSession: true,
   });
   assert.equal(frame.type, 4);
@@ -127,20 +129,30 @@ test("buildChatInvocation produces a type:4 chat invocation carrying the user te
   assert.equal(arg.traceId, "trace-id");
   assert.equal(arg.clientCorrelationId, "trace-id");
   assert.equal(arg.sessionId, "session-id");
+  assert.equal(arg.conversationId, "conversation-id");
+  assert.equal(arg.productThreadType, "Office");
+  assert.deepEqual(arg.clientInfo, { clientAppName: "Office", clientPlatform: "mcmcopilot-web" });
   assert.equal(arg.isStartOfSession, true);
   assert.ok(Array.isArray(arg.optionsSets));
-  assert.ok((arg.optionsSets as string[]).includes("rich_responses"));
+  assert.ok((arg.optionsSets as string[]).includes("enable_gg_gpt"));
   assert.ok(Array.isArray(arg.allowedMessageTypes));
   assert.ok((arg.allowedMessageTypes as string[]).includes("Chat"));
   const message = arg.message as Record<string, unknown>;
   assert.equal(message.author, "user");
   assert.equal(message.inputMethod, "Keyboard");
   assert.equal(message.messageType, "Chat");
+  assert.equal(message.requestId, "request-id");
   assert.equal(message.text, "protocol capture test. Reply with one word: pong.");
 });
 
 test("buildChatInvocation serializes/round-trips through the framing", () => {
-  const frame = buildChatInvocation({ text: "hi", traceId: "t", sessionId: "s" });
+  const frame = buildChatInvocation({
+    text: "hi",
+    traceId: "t",
+    sessionId: "s",
+    requestId: "r",
+    conversationId: "c",
+  });
   const wire = encodeFrame(frame);
   assert.ok(wire.endsWith(RECORD_SEPARATOR));
   const { frames } = splitFrames(wire);
diff --git a/tests/unit/m365-tone-model-variants.test.ts b/tests/unit/m365-tone-model-variants.test.ts
index 741ecd73a6..8860c17cdc 100644
--- a/tests/unit/m365-tone-model-variants.test.ts
+++ b/tests/unit/m365-tone-model-variants.test.ts
@@ -30,9 +30,10 @@ test("model-driven tone overrides the tier default; bare id keeps the tier tone"
   const enterprise = resolveChatInvocationOverrides("enterprise");
   const individual = resolveChatInvocationOverrides(undefined);
 
-  // enterprise tier default tone is Magic
+  // enterprise tier default tone is Magic; individual/EDU sends "magic" (#10718
+  // recapture — the old "" default was part of the silently-dropped shape)
   assert.equal(enterprise.tone, "Magic");
-  assert.equal(individual.tone, "");
+  assert.equal(individual.tone, "magic");
 
   // precedence: resolveToneForModel(model) ?? overrides.tone  (mirrors the executor wiring)
   const toneFor = (model: string | undefined, tierTone: string) =>
@@ -44,7 +45,7 @@ test("model-driven tone overrides the tier default; bare id keeps the tier tone"
 
   // the bare id keeps whatever the tier resolved
   assert.equal(toneFor("copilot-m365", enterprise.tone), "Magic");
-  assert.equal(toneFor("copilot-m365", individual.tone), "");
+  assert.equal(toneFor("copilot-m365", individual.tone), "magic");
 });
 
 test("registry exposes the bare id (first) plus every tone variant", () => {