Home › Microsoft Teams

Teams Sign-In Errors: How to Fix

Short answer: Teams sign-in errors usually come with a code that points to the cause.

TL;DR: quick fix

Note the error code shown.
Update Teams and restart your computer.
Sign out and back in, or try Teams on the web.

Is Microsoft Teams down?

Before you change settings, check Microsoft 365 Service health. If there's an outage, wait it out.

How to fix it: step by step

Note the error code shown.
Update Teams and restart your computer.
Sign out and back in, or try Teams on the web.
Reinstall Teams if errors continue.
On work accounts, ask IT to run the Teams sign-in diagnostic.

FAQ

Should I clear the Teams cache?

It can help; Microsoft also suggests reinstalling Teams.

More Microsoft Teams fixes

Microsoft Teams Not Loading or Stuck: Fixes
Teams Notifications Not Working: How to Fix
Teams Camera Not Working: Fix

Last checked Oct 2026 against the official help page: Microsoft Learn. Menus can differ by app version; follow the official page if a step doesn't match.