Additional sign-in or account-related issues within Microsoft Teams for business
I had exact same problem with the download on this Teams web site. Download and reloaded 3 times.
The only way resolved is to have someone send you a Teams meeting invite. Click on the the link and when you see the next web site that shows click oN DOWNLOAD TEAMS APP. Don’t click on the use internet browser or the use computer app.
When you click on Download Teams App, it downloads a different Teams App that actually WORKS RIGHT