I can't sign up for Microsoft Teams- infinite loop to nowwhere

MSUseless I too am stuck in the same infinite loop!  I am "signed in" to my Microsoft account, and have installed Teams, but each time I try to use it, it tells me that I need to register!  Then, when I try to register, it says that I am already logged in to Teams.  How it is possible for a supposedly professional organisation to distribute software that fails so spectacularly to work, or make any sense whatsoever, is beyond me!  It's like a child has written this and got his pet spider to test it!  I'm reverting to using Zoom!