Check that another app isn't using your device's camera. If one is, close that app to remove the black screen on FaceTime. Make sure the camera lens isn't blocked.

Learn how to use the multi-app camera feature in Windows 11 to allow multiple apps to use a camera or built-in webcam simultaneously.

Here’s how to do it: Back up your data using SmartSwitch or another backup method. Open the Settings app. Scroll down and tap General management. Tap Reset. Tap Factory data reset.