Close any applications that may still have access to the camera. Right-click on apps like Microsoft Teams or Zoom in the system tray and select "Quit." This alone often resolves the issue.
If the problem persists, click the search bar and search for "Turn off camera access for all applications." Navigate to the camera privacy settings. Toggle camera access off and on for specific apps, or disable camera access for all other applications while leaving it enabled only for the app being used.
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