A few of us at work have had huge issues with Microsoft Teams on our Macs with not being able to login for seemingly no reason at all. After a lot of messing around with uninstalling, reinstalling, restarting my machine etc. I finally dug in and got my hands dirty.
Here’s how to fix it:
Either open a terminal and enter:
OR manually navigate to…
…and delete the ‘Teams’ folder.
After that, reopen Teams, follow the steps, and you should be able to login okay.
Note: I also deleted the…
…folder but I’m 99.9999% sure that wasn’t necessary.
I hope that helps!