I was getting this error after a successful upgrade from Windows 10 to 11
I tried both method 1 and 2 with no success resolving the issue.
I tried deleting the Teams program and and downloading and installing a new one, still the problem persisted.
Finally resolved it for me by:
Go into Settings
Select Apps
Select the Startup tab
Scroll down to Microsoft Teams
Turn to Off
Shut down PC and restart, error no longer comes up.
I will have to monitor if having shut it off has any effect on any other apps I use, so far none and doubt it will.