Using Microsoft Teams on macOS, including installation, features, and compatibility
I can confirm that deleting the Application Support/Microsoft/Teams and com.microsoft.teams folders in combination with logging into a personal account and then switching to the work account works.
It was not necessary for me to delete the folders in between the switch, just upfront. (didnt test to not delete them)
I have a MacBookPro 2019 with BigSur and latest teams from the website (today, now downloaded).