[alxlu]

I've been running the latest version of macOS and I've never had to reboot to enable camera permissions for any app. I haven't had to do it on fresh install or upgrade. The only thing I've had to do is close the app and open it again after giving it camera permission on first install. Subsequent updates seem to keep that permission enabled...

[indymike]

I've had to reboot for video conference updates four times in the past two weeks. Perhaps someone has turned some security off on your Mac.