I have a Laptop ASUS ZenBook 15 UX534FTC-A8263R bought this month, with Win10 Pro. Camera worked fine for several days, but today it is not working in Skype, Zoom, Camera apps - but works ok on facial recognition login!
In device manager, I see 2 cameras, with the same name (!), but one with manufacturer Microsoft, and the other Realteck. I tried disabling them, new drivers, restart, etc - no success.
PS: also, google shows that there were previous questions on the same topic, but which were deleted. Please leave the questions, it saves time.