diff --git a/src/lib/providers/validation/webProvidersB.ts b/src/lib/providers/validation/webProvidersB.ts
index 3d9ddd84d4..6f1069f9ff 100644
--- a/src/lib/providers/validation/webProvidersB.ts
+++ b/src/lib/providers/validation/webProvidersB.ts
@@ -292,7 +292,7 @@ export async function validateCopilotWebProvider({ apiKey, providerSpecificData
   }
 }
 
-function extractM365CredentialParts(raw: string, providerSpecificData: Record<string, unknown>) {
+export function extractM365CredentialParts(raw: string, providerSpecificData: Record<string, unknown>) {
   const text = raw.trim();
   const parts: Record<string, string> = {};
 
@@ -304,13 +304,22 @@ function extractM365CredentialParts(raw: string, providerSpecificData: Record<st
     if (key && value) parts[key] = value;
   }
 
-  if (/^wss:\/\/substrate\.office\.com\/m365Copilot\/Chathub\//i.test(text)) {
+  // Accept the current M365 web endpoint (m365.cloud.microsoft, including
+  // regional subdomains) plus the two legacy hosts (substrate.office.com,
+  // copilot.microsoft.com). The path still carries /m365Copilot/Chathub/<tenant>,
+  // so extraction is unchanged. (OmniRoute issue #7078)
+  if (/^wss:\/\//i.test(text)) {
     try {
       const url = new URL(text);
-      parts.access_token ||= url.searchParams.get("access_token") || "";
-      parts.chathubPath ||= decodeURIComponent(
-        url.pathname.split("/m365Copilot/Chathub/")[1] || ""
+      const hostOk = /^(?:[\w-]+\.)*(?:m365\.cloud\.microsoft|copilot\.microsoft\.com|substrate\.office\.com)$/i.test(
+        url.hostname
       );
+      if (hostOk && url.pathname.startsWith("/m365Copilot/Chathub/")) {
+        parts.access_token ||= url.searchParams.get("access_token") || "";
+        parts.chathubPath ||= decodeURIComponent(
+          url.pathname.split("/m365Copilot/Chathub/")[1] || ""
+        );
+      }
     } catch {
       // Fall through to the structured key/value parser result.
     }
diff --git a/tests/unit/m365-web-token-extraction-7078.test.ts b/tests/unit/m365-web-token-extraction-7078.test.ts
new file mode 100644
index 0000000000..68ed08b7fc
--- /dev/null
+++ b/tests/unit/m365-web-token-extraction-7078.test.ts
@@ -0,0 +1,48 @@
+// Issue #7078 — Microsoft 365 Copilot web token extraction must accept the current
+// m365.cloud.microsoft endpoint (and legacy substrate.office.com / copilot.microsoft.com),
+// not just the old substrate.office.com WS host. Verifies access_token + chathubPath parse.
+import test from "node:test";
+import assert from "node:assert/strict";
+
+const B = await import("../../src/lib/providers/validation/webProvidersB.ts");
+const extract = (raw: string) =>
+  (B as Record<string, any>).extractM365CredentialParts(raw, {});
+
+test("#7078 m365.cloud.microsoft wss URL extracts access_token + chathubPath", () => {
+  const raw =
+    "wss://m365.cloud.microsoft/m365Copilot/Chathub/user@tenant.example.com?access_token=TOKEN123";
+  const parts = extract(raw);
+  assert.equal(parts.accessToken, "TOKEN123");
+  assert.equal(parts.chathubPath, "user@tenant.example.com");
+});
+
+test("#7078 regional subdomain m365.cloud.microsoft also accepted", () => {
+  const raw =
+    "wss://eu.m365.cloud.microsoft/m365Copilot/Chathub/user@tenant?access_token=TOKEN456";
+  const parts = extract(raw);
+  assert.equal(parts.accessToken, "TOKEN456");
+  assert.equal(parts.chathubPath, "user@tenant");
+});
+
+test("#7078 legacy substrate.office.com still works (no regression)", () => {
+  const raw =
+    "wss://substrate.office.com/m365Copilot/Chathub/user@tenant?access_token=LEGACY";
+  const parts = extract(raw);
+  assert.equal(parts.accessToken, "LEGACY");
+  assert.equal(parts.chathubPath, "user@tenant");
+});
+
+test("#7078 key/value string form still parsed", () => {
+  const raw = "access_token=KV;chathubPath=user@tenant";
+  const parts = extract(raw);
+  assert.equal(parts.accessToken, "KV");
+  assert.equal(parts.chathubPath, "user@tenant");
+});
+
+test("#7078 m365.cloud.microsoft with explicit :443 port still extracts (hostname, not host)", () => {
+  const raw =
+    "wss://m365.cloud.microsoft:443/m365Copilot/Chathub/user@tenant?access_token=TOKENPORT";
+  const parts = extract(raw);
+  assert.equal(parts.accessToken, "TOKENPORT");
+  assert.equal(parts.chathubPath, "user@tenant");
+});