Teams keeps hijacking FaceTime

This problem has been raised by several other people in several other forums but hasn't been fixed yet, so I'm raising it again: I am a Mac user who needs to make outgoing calls using FaceTime. I also am required by some clients to use teams. EVERY TIME I launch Teams it hijacks my FaceTime settings to make Teams the default setting for outgoing calls. I change the setting, Teams changes it back. I reinstall Teams, it makes no difference. This waste of my time is for "productivity" software? What a joke. Please advise on a permanent fix.