The “Settings -> Accounts -> Access work or school” is what needs to be done in most cases
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Check your ~/Library/Preferences folder. Your saved account information is stored in one of those .plists. If you look through all plists starting with “com.microsoft”, one of them should contain the information you want to delete.
In particular, I got rid of “com.microsoft.office.plist”.
delete the $HOME/Library/Application Support/Microsoft/Teams folder and restart Teams. Worked for me.