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This issue is primarily caused by a software conflict rather than faulty hardware. The main reasons include an outdated or corrupt camera driver that fails to communicate, another application ...
Zoom is unable to detect a camera in Windows 11 / 10? Execute the fixes listed here to get things back up and running in no time.
If Windows Hello Enhanced Sign-in Security is not working with external camera, enable ESS, make registry changes, manage Intune policy, etc.