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.