On my LG, when starting HDR content, a logo will appear in the top right corner; had to tell it which HMDI input to use for HDR to work at all. On the XB go to Video output then Advanced settings, will tell you there if it's working.I hear you on FM7, wanted to get that but reviews sounds like it's not much of an improvement over FM6.
Going to have to double check my settings, it sure the Xbox One X is outputting 4k and the TV resolution shows correctly when it powers on. Not sure on HDR though, need to check that for sure.
Also, a Dayton iMM-6 worked perfectly for voice control. The console also works well in powering on/off both my TV and AV receiver.
That's a clever idea on the iMM-6. I think I have one somewhere. Although I use my Harmony 650 remote more than the controller when searching in apps.
I worked at Compusa back in the day, we had networked gaming rigs in the breakroom. Lots of Unreal Tournament matches. Was great game for that time.