Pro Max 18 Plus MB18250, RGB Camera stopped working

Got a bit of an odd one... 

After doing a Dell Command update, 2 things were installed on the 8th - however , afterward - the built in webcam has stopped working. 

The boot diagnostics appear to indicate the device works. 

But the "camera" app crashes. I've deleted the camera in Device Manager. No joy. 

External / USB camera works no problems. 

The updates were : 

Intel PPM Provisioning Package 10.0.2 &

Dell Trusted Device 7.1.10 

I've uninstalled Dell Trusted Device, Dell Optimizer, Dell Pair... 

SFC  , DISM repair... 

No joy. 

Nothing I can see in the event viewer to give me any steer. 

The error on the Camera app is 0xA00F429E <PageOpenFailed> (0x80131505). 

25H2 uninstalled and reinstalled, just in case, but no change. 

Baffled!