Sometimes nothing helps - then you can

1. restart Microsoft Teams - close it, reopen it - sometimes it’s already fixing issuess
2. reset the Microsoft Teams app - see description below:

Windows Desktop

New Teams - Reset app

Note

When you reset the Teams app, the app data will be deleted. This includes any personalization settings that you might have configured.

1. Open the Microsoft settings or Type settings in the search box, and then select the Settings app from the results.
2. Select Apps > Installed apps, and then type Microsoft Teams in the search box.
3. Locate the New Microsoft Teams app from the results, select the More options button (...) on the right, and then select Advanced options.
4. In the Reset section, select Reset.
5. Restart Teams.