Clear Teams cache in Windows
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
In the Run dialog box, enter %appdata%\Microsoft\Teams, and then select OK.
Delete all files and folders in the %appdata%\Microsoft\Teams directory.
Clear Teams cache in macOS
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