Your webcam may not work on Windows 10 for several reasons. The usual troubleshooting steps apply, but Windows 10 has a new system-wide option that completely disables your webcam in all applications.
Check Windows 10 Camera Options
On Windows 10, the Settings app has a few switches that disable your webcam in all applications. If you disable your webcam here, even desktop applications won’t be able to use it.
This is a little confusing. In general, the app permissions options under Settings > Privacy mostly affect new Windows 10 apps from the Store, also known as UWP apps. But the webcam options also affect desktop apps.
If your webcam isn’t working, head to Settings > Privacy > Camera.
At the top of the window, ensure it says “Camera access for this device is on.” If it says camera access is off, click the “Change” button and set it to “On.” If camera access is off, Windows and applications on your system won’t be able to use the webcam. Not even Windows Hello sign-in will work.
Just under that, ensure “Allow apps to access your camera” is also set to “On.” If it’s set to Off, no applications on your system—including desktop applications—can see or use your camera. However, the Windows operating system can still use your camera for features like Windows Hello.
This option was changed with the release of Windows 10’s April 2018 Update. Previously, it only affected UWP apps and didn’t affect traditional desktop applications.
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