Just spent 30+ hours working on this so I thought I'd share
Had a few users contact me yesterday with the inability to use teams on their mac. Initial diagnosis was teams cache, so after combing thru thousands of posts and trying to clear the cache with no success, i began trying to uninstall/'reinstall, again, no success. This morning i was affected and ended up installing an OLD version of teams successfully. i tried to upgrade teams through the desktop client and same result. it was then that i noticed that the old version allowed me to use single sign on, and the new version wasnt even getting there.
the current resolution is that i have turned off ourMicrosoft Enterprise SSO plug-in for the affected devices.
if anyone happens to find the url for teams, feel free to share, or i will when i find it so i can put a nail in this coffin and be done with it. for today anyways.....until MS screws up something ELSE!