Using Microsoft Teams on macOS, including installation, features, and compatibility
I am in a similar situation except that I never even make it to a loading screen. The icon bounces in the Dock, I briefly see the Teams menu bar, and then it goes away, icon stops bouncing, and Teams never opens. No error message either. I have been able to uninstall and reinstall Teams, however, the issue reappears anywhere from a few days to a month later and I have to start all over again. I'm running Big Sur on a Macbook Pro in a managed environment.