Finally after creating my fourth MS account, where most even this current one resulted in the loop that my email was already registered with my organization and to use another account, I was able to open the desktop application. However, when I follow a "click here to join meeting" link, Teams does not open the meeting or any dialogue related to it. You have Microsoft Teams Version 1.4.00.4855 (64-bit). Xfce desktop 4.12 Debian GNU/Linux 10 (buster) Kernel 5.9.0-0.bpo.5-amd64