If Teams is still running, right-click the Teams icon on the taskbar, and then select Quit.
Open the Run dialog box by pressing the Windows logo key
+R.
In the Run dialog box, enter the following path, and then select OK: appdata%\Microsoft\Teams
Delete all files and folders in the directory.
Restart Teams.
Note: When you reset the Teams app, the app data will be deleted. This includes any personalization settings that you might have configured.
If Teams is still running, right-click the Teams icon on the taskbar, and then select Quit.
Open the Run dialog box by pressing the Windows logo key
+R.
In the Run dialog box, enter the following path, and then select OK. userprofile%\appdata\local\Packages\MSTeams_8wekyb3d8bbwe\LocalCache\Microsoft\MSTeams
Delete all files and folders in the directory.
Restart Teams.
If Teams is still running, right-click the Teams icon in the dock, and then select Quit or press Command (⌘)-Q.
In the Finder, open the /Applications/Utilities folder, and then double-click Terminal.
Enter the following command, and then press Return: rm -r ~/Library/Application\ Support/Microsoft/Teams
Restart Teams.
If Teams is still running, right-click the Teams icon in the dock, and then select Quit or press Command (⌘)-Q.
In the Finder, open the /Applications/Utilities folder, and then double-click Terminal.
Enter the following commands, and press Return after each command:
rm -rf ~/Library/Group Containers/UBF8T346G9.com.microsoft.teams
rm -rf ~/Library/Containers/com.microsoft.teams2
Restart Teams.