Indeed this is the description I find on Discover:
Unofficial Microsoft Teams client for Linux using Electron. It uses the Web App and wraps it as a standalone application using Electron.
The advantage compared to teams.microsoft.com (at least when I load it in Firefox), is that it has many more features, since I guess it’s using an “Edge” user agent, which unlocks stuff that is not enabled for FF. For example, I can have 1:1 calls (yeah, I know…) and blur my background or even set a background pic, all things I can’t really do on FF.
On the other hand, screen sharing works unreliably (at least in a Wayland session, X11 is fine). I’ve reported a bug to KDE since I assumed it’s a kwin issue, but I should test it with a gnome wayland live medium as well…