fix(msteams): remove remaining /.default postfix (#1574)

This fixes the msteams probe which otherwise incorrectly assumes teams is not working.

The @microsoft/agents-hosting SDK's MsalTokenProvider automatically appends /.default to all scope strings in its token acquisition methods (acquireAccessTokenViaSecret, acquireAccessTokenViaFIC, acquireAccessTokenViaWID, acquireTokenWithCertificate in msalTokenProvider.ts). This is consistent SDK behavior, not a recent change.

The current code is including .default in scope URLs, resulting in invalid double suffixes like https://graph.microsoft.com/.default/.default. I am not sure how the .default postfixed worked in the past for you if I am honest.

This was confirmed to cause Graph API authentication errors. Removing the .default suffix from our scope strings allows the SDK to append it correctly, resolving the issue. I confirmed it manually on my teams setup

Before: we pass .default -> SDK appends -> double .default (broken)
After: we pass base URL -> SDK appends -> single .default (works)

Co-authored-by: Christof Salis <c.salis@vertifymed.com>

extensions/msteams/src/probe.ts

@@ -65,7 +65,7 @@ export async function probeMSTeams(cfg?: MSTeamsConfig): Promise<ProbeMSTeamsRes
   try {
     const { sdk, authConfig } = await loadMSTeamsSdkWithAuth(creds);
     const tokenProvider = new sdk.MsalTokenProvider(authConfig);
-    await tokenProvider.getAccessToken("https://api.botframework.com/.default");
+    await tokenProvider.getAccessToken("https://api.botframework.com");
     let graph:
       | {
           ok: boolean;