diff --git a/extensions/msteams/src/probe.test.ts b/extensions/msteams/src/probe.test.ts
index c876a1469f4..a63bffef005 100644
--- a/extensions/msteams/src/probe.test.ts
+++ b/extensions/msteams/src/probe.test.ts
@@ -3,6 +3,15 @@ import type { MSTeamsConfig } from "../runtime-api.js";
 
 const hostMockState = vi.hoisted(() => ({
   tokenError: null as Error | null,
+  delegatedTokens: undefined as
+    | {
+        accessToken: string;
+        refreshToken: string;
+        expiresAt: number;
+        scopes: string[];
+        userPrincipalName?: string;
+      }
+    | undefined,
 }));
 
 vi.mock("@microsoft/teams.apps", () => ({
@@ -33,11 +42,20 @@ vi.mock("@microsoft/teams.api", () => ({
   }),
 }));
 
+vi.mock("./token.js", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("./token.js")>();
+  return {
+    ...actual,
+    loadDelegatedTokens: () => hostMockState.delegatedTokens,
+  };
+});
+
 import { probeMSTeams } from "./probe.js";
 
 describe("msteams probe", () => {
   beforeEach(() => {
     hostMockState.tokenError = null;
+    hostMockState.delegatedTokens = undefined;
     vi.stubEnv("MSTEAMS_APP_ID", "");
     vi.stubEnv("MSTEAMS_APP_PASSWORD", "");
     vi.stubEnv("MSTEAMS_TENANT_ID", "");
@@ -83,4 +101,38 @@ describe("msteams probe", () => {
       error: "bad creds",
     });
   });
+
+  it("reports delegated tokens expired when the process clock is invalid", async () => {
+    const nowSpy = vi.spyOn(Date, "now").mockReturnValue(Number.NaN);
+    hostMockState.delegatedTokens = {
+      accessToken: "delegated-token",
+      refreshToken: "refresh-token",
+      expiresAt: Date.parse("2030-01-01T00:00:00.000Z"),
+      scopes: ["ChatMessage.Send"],
+      userPrincipalName: "user@example.com",
+    };
+    const cfg = {
+      enabled: true,
+      appId: "app",
+      appPassword: "pw",
+      tenantId: "tenant",
+      delegatedAuth: { enabled: true },
+    } as unknown as MSTeamsConfig;
+
+    try {
+      await expect(probeMSTeams(cfg)).resolves.toEqual({
+        ok: true,
+        appId: "app",
+        graph: { ok: true, roles: undefined, scopes: undefined },
+        delegatedAuth: {
+          ok: false,
+          scopes: ["ChatMessage.Send"],
+          userPrincipalName: "user@example.com",
+          error: "token expired (will auto-refresh on next use)",
+        },
+      });
+    } finally {
+      nowSpy.mockRestore();
+    }
+  });
 });
diff --git a/extensions/msteams/src/probe.ts b/extensions/msteams/src/probe.ts
index a0ab0429732..d30e3f9c415 100644
--- a/extensions/msteams/src/probe.ts
+++ b/extensions/msteams/src/probe.ts
@@ -1,3 +1,4 @@
+import { isFutureDateTimestampMs } from "openclaw/plugin-sdk/number-runtime";
 import {
   normalizeStringEntries,
   type BaseProbeResult,
@@ -100,7 +101,7 @@ export async function probeMSTeams(cfg?: MSTeamsConfig): Promise<ProbeMSTeamsRes
       try {
         const tokens = loadDelegatedTokens();
         if (tokens) {
-          const isExpired = tokens.expiresAt <= Date.now();
+          const isExpired = !isFutureDateTimestampMs(tokens.expiresAt);
           delegatedAuth = {
             ok: !isExpired,
             scopes: tokens.scopes,