What to try when (3D Viewer) mixed reality not recognising your laptop built-in camera

Finally, it works :)

Today I try to use 3d viewer and then try to used the 3d model in mixed reality. But the app (mixed reality) always ask me to setup camera first. But another application can use my laptop built in camera normally.
I then search the web, of course, looking for other user with same problem. I found a couple, but no solution could cure my finding.
But, then I try to update the camera driver via windows device manager. It appear that windows find more updated driver and install it. When I open 3D viewer again, tap on mixed reality, it does recognize my camera. May be, you can try that to if you have same problem. Hope this help.