Try these steps in order for error 0xA00F4244 <NoCamerasAreAttached>:
- Check for a physical camera block
- Look for a camera key on the keyboard, usually on one of the F1–F12 keys.
- Press that key, or Fn + that key, if it has a camera icon.
- Also check whether the webcam has a privacy slider/shutter and open it if present.
- Run the camera troubleshooter
- Open the Get Help app and run the automated camera troubleshooter.
- It can automatically diagnose and fix many camera problems.
- Verify camera privacy settings
- Go to Start > Settings > Privacy & security > Camera.
- Make sure Camera access is On.
- Make sure Let apps access your camera is On.
- Check whether the camera is disabled in Windows
- Go to Start > Settings > Bluetooth & devices > Cameras.
- If the camera appears under Disabled cameras, select it and choose Enable.
- Administrator access is required for this step.
- Check Device Manager
- Open Device Manager.
- If the camera is listed, make sure it is enabled. If Disable is available, the camera is already enabled.
- If it is missing, in Device Manager use View > Show hidden devices, then Action > Scan for hardware changes.
- Reinstall the camera driver
- In Device Manager, expand Cameras.
- If the camera appears, double-click it, open the Driver tab, and select Uninstall Device.
- Select Attempt to remove the driver for this device, then select Uninstall.
- Restart the PC.
- Warning: Do not do this on Surface Pro X. On that device, uninstalling drivers may require a full system reset to restore them.
- Force a restart if using Surface
- Select Start > Power > Shut down.
- After it shuts down, press and hold the power button for 20 seconds.
- If the logo appears after a few seconds, keep holding until it appears again.
- If the camera still does not appear
- Install the latest camera driver for the exact PC model from the PC manufacturer.
- If the camera still is not detected after these steps, the issue may be hardware-related and service may be required.
References:
- Surface camera not working
- Manage cameras with Camera settings in Windows 11
- Troubleshoot audio and video in Skype for Business
- camera not working - Microsoft Q&A camera is reporting that it is blocked or turned off by a switch or button on your device
- camera not attached (how to fix???) - Microsoft Q&A
- regarding camera - Microsoft Q&A