Have to find something for their engineers to do so they don't have time to make Teams usable
I have set Firefox as deault web browser, but Teams still opens urls in Edge. And I could not find a way to fix it, or identify why Teams is doing it?
Open Edge and go to Settings > Profiles > Profile preferences and toggle off "Use Microsoft Edge to open links from other Microsoft apps".
Probably to increase the friction of using other browsers. It will be simpler for many users to keep all their bookmarks, history, and saved passwords in one browser. If Microsoft's products require Edge, it's going to channel more users to Edge due to reduced friction.
I’m not sure you have things configured correctly, or your Organization has added some thirty-party security stuff on top of Teams.