The "update" is that the Teams Desktop Application for Linux was discontinued last year, and the only supported way to use Teams on Linux is now to open https://teams.microsoft.com in Google Chrome or Chromium (audio/video calls don't work on Firefox).
Since Chrome/Chromium supports screen sharing with Wayland, it simply just works for me nowy while it never worked with the Elecrton-based desktop application.
Since Chrome/Chromium supports screen sharing with Wayland, it simply just works for me nowy while it never worked with the Elecrton-based desktop application.