Camera not working?
1 · Permission
Click the camera icon in the address bar and choose Allow. Browsers remember a "Block" forever until you change it there.
2 · Camera in use
Only one app can use most webcams at a time. Close Zoom, Teams or OBS, then reload this page.
3 · Privacy shutter & OS
Check for a physical lens cover, and on Windows: Settings → Privacy → Camera → allow desktop apps and browsers.