Changing between multiple Teams Free accounts within the app or browser
"I think I just need to delete all of the local files that were installed on the Ubuntu machine and delete the app to get things working again. It works fine from my cellphone and iPad. If I try to join a meeting from the browser it seems to work. It is only the Ubuntu app that causes issues"
Please refer to this article on how to reset the MS Team app by clearing the cache files: https://askubuntu.com/questions/1257898/reset-m...;
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There's a link above from the non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.
Kind Regards