TCL Series 6 Roku TV and Volume control
Not a question, but a solution that I finally found...I'll add the kudos to NevadaDan https://discussions.apple.com/thread/8581751
This worked perfectly!! Took the 4K Apple TV to different TV (in different room), and the TCL Roku remote. Got the ATV to learn the remote, back to the new TCL tv, plugged everything back together, selected the custom remote to control via IR and BOOM the ATV Siri remote finally controls TV volume...
BTW, didn't have to do this circle j with my Panasonic or Sony TV's....just sayin....
Apple TV 4K, tvOS 13