Is the display dock compatible with 4K TVs?

[Windows Central Question]

I have a Vizio M55-C2 4K TV and currently when I use my 950 XL with the Display Dock over HDMI I get no sound. The TV is getting 1080P and I have tried everything I can think of. Changed sound settings on the TV, restarted everything, different HDMI cables, and even checked for updates. Still nothing. I know that the sound is stupidly tied to the resolution but I'm at 1080P. I'm a bit dumbfounded that this isn't a setting I can just toggle. Further, this really reduces my potential uses for the Display Dock and continuum on a whole if I can't trust the equipment to perform.

 

[albe231]

I'm having the same issue on my 4K TV as well. I even tried enabling/disabling my TV Speakers and changing volume like I've read elsewhere. Still doesn't work.