Microsoft Teams login issues? Try these 7 steps

If you’re experiencing Microsoft Teams login issues on PC or Laptop, you can try some of the options given in this article to resolve the issue.

First, check to make sure that your email address and password are entered correctly. If they are, and you’re still having trouble, try some of the “How to fix Microsoft Teams login issues” that follow below.

Microsoft Teams login issues

Microsoft Teams login issues on PC, Microsoft Teams login issues in Laptop

Run the Teams Sign-in diagnostic

You can run Teams Sign-in tests if you’re signed in with Microsoft 365 administrator account. (Please note: This feature isn’t available for Microsoft 365 Government, Microsoft 365 operated by 21Vianet, or Microsoft 365 Germany.)

This feature requires a Microsoft 365 administrator account.

1. Click on this URL: https://aka.ms/TeamsSignInDiag
2. Enter the email address of the user having sign-in issues. (See diagram below)

Use SaRA (Microsoft Support and Recovery Assistant)

1. Click on this URL to download SaRA: https://aka.ms/SaRA-TeamsSignInScenarioDocs
2. When SaRA is running click on Teams tab to run the Teams Sign-in Tests. (See picture below).

Fix the issue manually

1. If the Teams Sign-in diagnostics detects an issue that may be affecting MS teams, just do what is suggested to sort out the issue.
2. If, however no issue is detected then check if the Teams Desktop App is up-to date. (Teams Web Client is always up to date)
   1. Click the Settings and more menu next to the user’s profile picture at the top right of the Teams window, and then click Check for updates.
   2. If you find that the Teams Desktop App is missing the latest updates, install them and try signing in again.
   3. If the issue persists, then uninstall MS Teams with a view to re-installing it afterwards.
3. More Details of fixing Teams sign-in issues manually are found here at: Fix the issue manually

Microsoft Teams login loop

If you’re using Teams web client (on the browser) and you get stuck in a login loop, there’re browser specific steps on how to fix Microsoft Teams login issues.

• Google Chrome – tips to fix Microsoft Teams login issues.
• Microsoft Edge – tricks to fix Microsoft Teams login issues.
• Mozilla Firefox – Teams login loop fix.
• Safari – what to do to fix Teams login loop.

Microsoft Teams not logging in Windows 10

If you’re experiencing Microsoft Teams not logging or signing in Windows 10 / 11 try clearing your Microsoft Teams cache. Be aware that deleting MS Teams cache does not affect user data. You also need to restart Teams afterwards.

Follow the process described below to clear MS Teams cache

1. If your Teams client is running then right-click Teams icon in the taskbar and select Quit.
2. Type “%appdata%\Microsoft\Teams” in the search field and press Enter on keyboard
3. Select ALL files and folders in the window that opens from step 2 by pressing “Ctrl + A“
4. Press the ” Delete” key to delete all the files and folders selected.
5. Restart MS Teams client on your PC.

Clear Teams cache in macOS system, please follow the procedure as described here.

Microsoft Teams login issues after password change

What is modern authentication?
Modern authentication is an umbrella term for a combination of authentication and authorization methods that include: (1) Authentication methods: Multi-factor Authentication; Client Certificate-based authentication. (2) Authorization methods: Microsoft’s implementation of Open Authorization (OAuth).

Microsoft

If you receive a message saying “Either your password changed or the server needs your sign-in info again” after changing your password, then do the following.

• Restart the computer to supply a new modern authentication token and try to sign in again.
• If you still can’t sign in, sign out, and then sign in again using the old (or incorrect) credentials. After it fails, enter in your correct credentials.

Microsoft Teams not working

If Microsoft Teams is not working on Windows 10 / 11 on your PC (Laptop or Desktop PC) where you have the Teams desktop app installed, there are things you can try to do to resolve the problem.

1. Check that your Internet connection is working.
2. Delete Microsoft Teams Cache

Deleting Microsoft Teams Cache

Please Note: Deleting MS Teams cache does not affect user data.
You also need to restart your Teams app afterwards.

Clear MS Teams cache as follows:

1. If your Teams client is running then right-click Teams icon in the taskbar and select Quit.
2. Type “%appdata%\Microsoft\Teams” in the search field and press Enter on keyboard
3. Select ALL files and folders in the window that opens from step 2 by pressing “Ctrl + A“
4. Press the ” Delete” key to delete all the files and folders selected.
5. Restart MS Teams client on your PC.

What is Caa20001?

Caa20001 is a Teams Error code you get when attempting to log into Microsoft Teams, when the email account you’re using to log into MS Teams is disabled.

Related Posts:

• How to improve MS Teams performance on Windows PC?
• Microsoft Teams Login Loop (Web Client): How to Fix it
• Deleting Teams Cache (Files / Folders)

Further Reading:

• Resolve sign-in errors in Teams
• Why am I having trouble signing in to Microsoft Teams?