Hi there,
Thank you for posting to Microsoft Community.
When the inbuilt camera is installed and working, the system and the applications in the system are by default programmed to recognize this camera. This can be overridden only if that option is available in the particular program you are using. If not, the only option would be to proceed with disabling the camera from the ‘Device manager’, this will force the application to take the other available options, in this case the mobile camera.
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Hope it helps.
Aaron Summith
Microsoft Community - Moderator