To use your Android phone as a webcam on Windows 11, follow these steps based on the information provided in the search results:

  1. Prerequisites:

    • An Android phone running Android 9.0 or later.
    • The Link to Windows app installed on your Android device with version 1.24012 or greater.
    • A Windows 11 PC enrolled in the Windows Insider program (this feature is currently being rolled out to Insider Channels).

  2. Enable the feature on Windows 11:

    Go to Settings -> Bluetooth & devices -> Mobile devices, and select "Manage devices". Then, allow your PC to access your Android phone. Your PC will receive a Cross Device Experience Host update from the Microsoft Store, which is required for this functionality.

  3. Pair your Android phone with your PC:

    On your Android device, open the Link to Windows app and make sure it's connected to your PC.

  4. Use your Android phone as a webcam:

    In any video application on your Windows 11 PC, you should now be able to switch between front and back cameras, pause the stream during interruptions, and utilize any effects provided by your mobile model. This feature supports various video conferencing platforms like Zoom, Google Meet, and Microsoft Teams.

Note that this feature is still being tested among Windows Insiders, so it may not be immediately available for everyone. When it does become generally available, these instructions should apply to non-Insider versions of Windows 11 as well.

For reference, the sources provided additional details: