diff --git a/changelog.d/fixes/10877-quota-alias-fetcher-lookup-gap.md b/changelog.d/fixes/10877-quota-alias-fetcher-lookup-gap.md
new file mode 100644
index 0000000000..9501c6dad2
--- /dev/null
+++ b/changelog.d/fixes/10877-quota-alias-fetcher-lookup-gap.md
@@ -0,0 +1 @@
+- **fix(sse):** `getResetAwareProvider()` and the auto-combo quota lookup in `combo.ts` now canonicalize the provider id via `resolveProviderId()` before calling `getQuotaFetcher()`, so a fetcher registered under a provider's canonical id (e.g. `ollama-cloud`, `codex`) is found for combo targets stored under an alias spelling (e.g. `ollamacloud`, `cx`) instead of silently degrading reset-aware/reset-window/auto quota-aware routing to plain priority ordering (#10877)
diff --git a/open-sse/services/combo.ts b/open-sse/services/combo.ts
index cf602cf98d..f9947bb71c 100644
--- a/open-sse/services/combo.ts
+++ b/open-sse/services/combo.ts
@@ -64,6 +64,7 @@ import { getHiddenModelsByProvider } from "@/models";
 import { resolveModelLockoutSettings } from "../../src/lib/resilience/modelLockoutSettings";
 import { fetchCodexQuota } from "./codexQuotaFetcher.ts";
 import { evaluateQuotaCutoff, getQuotaFetcher, type QuotaInfo } from "./quotaPreflight.ts";
+import { resolveProviderId } from "../../src/shared/constants/providers.ts";
 import * as semaphore from "./rateLimitSemaphore.ts";
 import { getCircuitBreaker } from "../../src/shared/utils/circuitBreaker";
 import { parseModel } from "./model.ts";
@@ -491,7 +492,10 @@ export async function buildAutoCandidates(
       let quotaRemaining = 100;
       let quotaCutoffBlocked = false;
       let quotaCutoffReason: string | undefined;
-      const fetcher = getQuotaFetcher(provider);
+      // #10877: `provider` here may be a legacy/user-facing alias spelling
+      // (target.provider/parseModel output); canonicalize before the fetcher
+      // registry lookup so aliased combo members still hit quota-aware scoring.
+      const fetcher = getQuotaFetcher(resolveProviderId(provider));
       const connection = target.connectionId ? connectionById.get(target.connectionId) : undefined;
       const authType = typeof connection?.authType === "string" ? connection.authType : null;
       const sessionAvailability =
diff --git a/open-sse/services/combo/quotaScoring.ts b/open-sse/services/combo/quotaScoring.ts
index 4a853b1455..a107768278 100644
--- a/open-sse/services/combo/quotaScoring.ts
+++ b/open-sse/services/combo/quotaScoring.ts
@@ -14,6 +14,7 @@ import { isRecord } from "./comboData.ts";
 import type { SlaRoutingPolicy } from "../autoCombo/routerStrategy.ts";
 import { RESET_WINDOW_NAMES } from "./types.ts";
 import type { ResolvedComboTarget } from "./types.ts";
+import { resolveProviderId } from "../../../src/shared/constants/providers.ts";
 
 const RESET_AWARE_SESSION_WINDOW_MS = 5 * 60 * 60 * 1000;
 const RESET_AWARE_WEEKLY_WINDOW_MS = 7 * 24 * 60 * 60 * 1000;
@@ -138,7 +139,11 @@ export function resolveSlaRoutingPolicy(
 
 export function getResetAwareProvider(target: ResolvedComboTarget): string | null {
   const provider = (target.providerId || target.provider || "").toLowerCase();
-  return provider || null;
+  // #10877: combo targets can carry a legacy/user-facing alias spelling
+  // (e.g. "ollamacloud", "cx") while quota fetchers register under the
+  // canonical provider id (e.g. "ollama-cloud", "codex"). Canonicalize here
+  // so getQuotaFetcher() lookups downstream (quotaStrategies.ts) find them.
+  return provider ? resolveProviderId(provider) : null;
 }
 
 function normalizeResetAt(value: unknown): string | null {
diff --git a/tests/unit/quota-scoring-alias-lookup-10877.test.ts b/tests/unit/quota-scoring-alias-lookup-10877.test.ts
new file mode 100644
index 0000000000..4039ceeffc
--- /dev/null
+++ b/tests/unit/quota-scoring-alias-lookup-10877.test.ts
@@ -0,0 +1,66 @@
+import { test } from "node:test";
+import assert from "node:assert/strict";
+import { getResetAwareProvider } from "../../open-sse/services/combo/quotaScoring.ts";
+import { registerQuotaFetcher, getQuotaFetcher } from "../../open-sse/services/quotaPreflight.ts";
+import { resolveProviderId } from "../../src/shared/constants/providers.ts";
+import type { ResolvedComboTarget } from "../../open-sse/services/combo/types.ts";
+
+function buildTarget(provider: string): ResolvedComboTarget {
+  return {
+    kind: "model",
+    stepId: "s1",
+    executionKey: "e1",
+    modelStr: `${provider}/some-model`,
+    provider,
+    providerId: provider,
+    connectionId: "conn-1",
+    weight: 1,
+    label: null,
+  } as ResolvedComboTarget;
+}
+
+test("#10877: getResetAwareProvider() canonicalizes an alias-spelled provider so the fetcher registered under the canonical id is found", () => {
+  registerQuotaFetcher("ollama-cloud", async () => ({ ok: true }) as never);
+
+  const target = buildTarget("ollamacloud");
+  const lookedUpProvider = getResetAwareProvider(target);
+
+  assert.equal(
+    lookedUpProvider,
+    resolveProviderId("ollamacloud"),
+    "getResetAwareProvider() should return the canonical provider id, not the raw alias"
+  );
+
+  const fetcher = getQuotaFetcher(lookedUpProvider!);
+  assert.notEqual(
+    fetcher,
+    undefined,
+    "a fetcher registered under the canonical provider id must be found for an alias-spelled combo target"
+  );
+});
+
+test("#10877: getResetAwareProvider() is a no-op (same cache key) for already-canonical provider ids", () => {
+  registerQuotaFetcher("codex", async () => ({ ok: true }) as never);
+
+  const target = buildTarget("codex");
+  const lookedUpProvider = getResetAwareProvider(target);
+
+  assert.equal(lookedUpProvider, "codex");
+  assert.notEqual(getQuotaFetcher(lookedUpProvider!), undefined);
+});
+
+test("#10877: getResetAwareProvider() returns null when neither providerId nor provider is set", () => {
+  const target = {
+    kind: "model",
+    stepId: "s1",
+    executionKey: "e1",
+    modelStr: "unknown/model",
+    provider: "",
+    providerId: "",
+    connectionId: "conn-1",
+    weight: 1,
+    label: null,
+  } as ResolvedComboTarget;
+
+  assert.equal(getResetAwareProvider(target), null);
+});