Help and support for HDHomeRun DVR and HDHomeRun software for Windows 10, Mac, Android, XBox, etc.
Is this going to be a permanent limitation from Silicon Dust? I just tested the latest Channels (beta) app on my (non-4K) AppleTV HD and it is tuning and playing ATSC 3.0 video/audio just fine.
It's a limitation from Dolby. Dolby didn't get paid a license for those codecs for the 4th gen Apple TV, so any app that is enabling such things might not be on Dolby's good side, once they hear of it.