If you’re unable to sign in to the Microsoft Teams desktop client, and the cause isn’t immediately clear, try the following step-by-step troubleshooting process. Check after each step to see if the issue is resolved.

🧪 Troubleshooting Checklist

1. Sign in via Teams Web App

• Go to https://www.office.com
• Sign in with your Office 365 account
• Click the App Launcher (top-left corner) and select Teams

2. Sign Out and Back In on the Desktop App

• Open the Teams desktop app
• Sign out completely
• Sign back in using your Office 365 credentials

3. Repair and Reset the Teams Client

• Go to Settings > Apps > Installed apps
• Search for Microsoft Teams
• Click Advanced options
• First try Repair, then Reset if needed

4. Clear Teams Cache via File Explorer

• Open File Explorer
• Navigate to: C:\Users\\AppData\Roaming\Microsoft\Teams
• Delete the contents of the folder (not the folder itself)

5. Restart Your Device

• After completing the steps above, restart your computer and try signing in again

If the issue persists after all steps, consider reinstalling the Teams app or contacting your IT administrator for deeper diagnostics.