Clear the cache in Teams for macOS

1. If Teams is still running, right-click the Teams icon in the dock, and select Quit or press Command (⌘)-Q.
2. In the Finder, open the /Applications/Utilities folder, and then double-click Terminal.
3. Enter the following command, and then press Return:
   Console

   rm -r ~/Library/Application\ Support/Microsoft/Teams

4. Restart Teams.

1. If Teams is still running, right-click the Teams icon in the dock, and then select Quit or press Command (⌘)-Q.
2. In the Finder, open the /Applications/Utilities folder, and then double-click Terminal.
3. Enter the following commands, and press Return after each command:
   Console

   rm -rf ~/Library/Group Containers/UBF8T346G9.com.microsoft.teams
   rm -rf ~/Library/Containers/com.microsoft.teams2

4. Restart Teams.

Source: https://learn.microsoft.com/en-us/microsoftteams/troubleshoot/teams-administration/clear-teams-cache