Webcam issue with UZ2315H screen through WD15 dock

Hi,

I've just built a near perfect  home office setup.

- XPS13 9350, 16GB RAM, 512SSD, Skylake i7

- Dell WD15 Dock (tried and failed with the delinquent TB15 variant)

- Dell UZ2315H monitor into the dock, via HDMI for graphics, and USB for the monitor's camera and audio bar.

My problem is just this:-

Through the single USB C connection to the dock, everything works perfectly except the screen's built in webcam

. 

When I plug the screen's USB cable directly into the laptop, it works fine, and I can toggle between the laptop webcam and the screen webcam.

Any tips? I think I'm up to date with all drivers..

Thanks in advance.