NEW Apple TV 4K --> Denon 3700h --> Sony A80J
Someone else posted this but couldn't respond to it and it directed me to here but anyway for NO DOLBY VISION activated when using ATV to Denon to Sony. But Atmos will work.
When connecting directly to Sony TV both DV DA work no problem.
This was no problem on my old LG CX
HDMI: Belkin 48GBPS
Denon: Set to enhanced 8K and using eARC out/in etc
Apple TV: Match content etc on; YCbCr on with 4:4:4 - video capability checked
Firmware/Software all updated for all devices.