AADSTS700082: the teams-mcp refresh token expired after long idle

AADSTS700082: the teams-mcp refresh token expired after long idle

TL;DR: Re-run npx @floriscornel/teams-mcp@latest authenticate; the cached refresh token in ~/.teams-mcp-token-cache.json expired after 90 days idle. Token refresh is silent until the refresh token itself dies, then the first call after the gap fails. Nothing else needs changing; the new grant overwrites the stale cache.

The error

AADSTS700082: The refresh token has expired due to inactivity

Fix it

1. Confirm the token cache file is old (~/.teams-mcp-token-cache.json).

Expected: Its timestamp is months back.

1. Run npx @floriscornel/teams-mcp@latest authenticate and complete login.

Expected: A fresh token set is cached.

1. Call the auth_status tool.

Expected: It shows authenticated again.

When this applies

teams-mcp auth breaks with an AADSTS error after a long period without use.

When this does NOT apply

If it never worked, the initial login is the problem. Device-code expiry mid-login is a different error.

Tool compatibility

@floriscornel/teams-mcp with MSAL token cache

Also seen as

• teams-mcp AADSTS700082
• teams MCP refresh token expired
• teams-mcp idle auth failure

Why it happens

MSAL refresh tokens expire after 90 days of inactivity. The server refreshes access tokens silently, so the expiry is invisible until the first use after the gap, which then fails.

Edge cases

• Scheduled jobs that run quarterly will hit this every time; re-auth before the run.
• Deleting the cache file forces a clean login if the flow misbehaves.
• The auth metadata file (~/.msgraph-mcp-auth.json) is separate and usually fine.