Hi @Richard Cannon ,
Close any other apps that might be using the camera. Then go to Settings > Privacy & security > Camera, check the recent activity, and make sure camera access is enabled for the app you’re using.
If the problem continues, open Device Manager, find your webcam under Cameras, and try updating its driver. Restart your laptop and test the Windows Camera app. If it works there, check the camera settings in the affected app
Let me know how it goes
Elvis