Using Microsoft Teams on macOS, including installation, features, and compatibility
I tried all previous steps, none worked.
However this did.
Remove the Microsfoft Teams folder as previously mentioned and delete the app.
Re-install app so that it asks you to log in:
Do not use the account that it hangs with, I logged in with my personal account instead of my work one and it got passed the loading hang screen. I then signed out and signed back in with the original work account i was having the hang with. It then got passed the hanging loading screen.
So what I would suggest is try a different account (create another MS one if you do not have another)
Then revert to original.
Note: You will have to delete the folders in library as previously mentioned and reinstall app, otherwise it will not present you with the account login before the hanging loading window.
Hope this helps