Hello domcarter,
Thank you for reaching out Surface Community. Please check which Microsoft Store apps can use the camera.
- Go to Start > Settings > Privacy > Camera.
- Turn on Allow apps to access your camera.
- Under Choose which apps can access your camera, turn the individual settings for apps On or Off.
If issue persist open Windows PowerShell as administrator and enter this: Get-AppXPackage | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}
Exit Windows PowerShell the restart the Surface.
If this works, we highly encourage you to inform our Community by clicking on Yes or marking my post as an answer. This will help other members who may have the same issue as you. Otherwise, don't hesitate to update us so we can further assist you.
Regards,
KarenJune_F