Clear Teams cache - Microsoft Teams
 Camera not working in teams
If teams repeatedly prompts for Camera rights in Privacy settings even thoug it is already enabled, this is the fix!
Delete the files
- 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.
 
Console
%userprofile%\appdata\local\Packages\MSTeams_8wekyb3d8bbwe\LocalCache\Microsoft\MSTeams
- Delete all files and folders in the directory.
 - Restart Teams.