Hi @Randi
According to your description, I have the following questions to confirm with you:
- Does anyone else have the same problem in your organization?
- When you use Teams web client, do problems still exist?
- Is there an error code in the lower left corner when logging in?
For login problems, in general, please follow the following methods to solve them.
- Try logging in to the web client and make sure you have a stable network connection.
- Clear the cache.
- If Teams is still running, right-click the Teams icon in the taskbar, and then select Quit.
- Open the Run dialog box by pressing the Windows logo key +R.
- In the Run dialog box, enter %appdata%\Microsoft\Teams, and then select OK.
- Delete all files and folders in the %appdata%\Microsoft\Teams directory.
- Restart Teams.
- Check for updates. Older versions of MS Teams may not be compatible, creating an unfavorable environment for the MS Teams application to function properly, ultimately causing this error.
- Check your login credentials. Logging in to a different account on the device may result in an error.
- Additionally, you can run Teams sign-in diagnostics in the admin center to resolve this issue.
For more details about troubleshooting Teams sign-in, you could refer to this article.
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