Additional features, settings, or issues not covered by specific Microsoft Teams categories
I don't know if it's me, but it looks like you're experiencing this issue:
I too have this problem and went through all the troubleshooting steps :
-Camera works in other apps (Zoom, Windows Camera App)
-Uninstalled the camera drivers, rebooted and reinstalled the drivers: it fixed the issue the first time it happened (last week), but the issue came back a few days later
-Installed all available Windows Update (I'm using 1903)
-Uninstalled Teams, rebooted and reinstalled
The issue seems to be affecting Insider Preview users, but I'm using 1903 on that particular computer
Thanks for your help