Just to add my monitor is a BenQ EX2780Q. I normally run 2560 x 1440 res @ 120hz.
Running icue in single monitor mode - the video lighting mode is selectable, it just does nothing. Other modes work as expected.
I've tried it with HDR both on and off. Tried it with Gsync on and off. Tried it in 1080 resolution - I've had no success.