That is odd. A large school I work with in the UK rolled out Teams as an emery year measure yesterday. Everyone was happily doing group video chats, no problem.
I think it works fine for people who have accounts set up. But if you get invited to a Teams (or Skype for Business) meeting, you are often required to log in with an account. This is very different from Zoom, which you can participate in without an account.
I have also been sent in infinite loops of download installer, install, now go download installer again.
