I had a peak on this in a debugger (Since I have the same camera, and suffers from the same problem.)
It seem like there is a race condition // dangling handle error in WINBIOSTORAGEADAPTER.DLL.
The process is crashing due to UnlockFileEx throwing an INVALID_HANDLE exception.
And the reason for this is that the file handle passed to UnlockFileEx has been closed already by another thread. - So the handle is accessed after closure.
...
So.. We need Microsoft - to investigate this since it's their module.
Per Larsson, as there have been a few different issues raised here, which one is this? Does this align with the message when trying to set up the BRIO for Hello "Sorry, something went wrong. Camera is currently in use by another app. Close the app and try again." (when it's obviously not in use, as easily proven by the fact that it works with any other app started after this and by the fact that the attempt to set up Hello does turn on the camera red light) or one of the other reported problems using Brio 4k with Hello?
Currently, my hope is that a new install of the upcoming Windows 11 or the new Dell 4k camera will resolve the problem. I have lost any hope of the BRIO working on my desktop PC with Windows 10 Hello. I currently use a fingerprint reader with Hello, which is not as convenient as when the BRIO worked for Face Recognition, but it's not too bad. And the BRIO still works fine for everything else, just not with Hello.