Microsoft Teams

Microsoft Teams Not Working for You? It Might Not Be an Outage

If the status above shows no ongoing outage but Microsoft Teams isn't loading for you, the problem is likely on your side or with your internet provider.

Common Reasons Microsoft Teams Stops Working

• Microsoft 365 backend outage affecting Teams messaging, calls, or meetings
• Teams-specific server issue while other Microsoft services work fine
• Corporate VPN or firewall blocking Teams' required UDP ports (3478–3481) for calls
• Stale Teams client cache causing crashes or blank screen on startup
• Guest account vs organizational account on different authentication paths

How to Fix Microsoft Teams Not Working

1. Check the Teams service status at admin.microsoft.com/servicestatus
2. Clear the Teams desktop cache: quit Teams, delete %appdata%/Microsoft/Teams on Windows or ~/Library/Application Support/Microsoft/Teams on Mac, reopen
3. Try Teams in a browser at teams.microsoft.com if the desktop app fails
4. For call/meeting issues, check that your firewall allows UDP ports 3478–3481 (required for Teams calls)
5. Sign out and back in at teams.microsoft.com to refresh your authentication token
6. Contact your IT admin if the issue affects your whole organization — it may be a tenant configuration