Apple TV 4K: No Dolby Vision If Connecter to Denon AVR

I recently bought the Denon AVR-X3600H to replace a Sony receiver in our home theater system. When Apple TV 4K is connected to the Sony TV (Sony XR77A80J), we cannot view Dolby Vision content when using eArc passthrough for audio only. When we select audio through the TV only, not passthrough the Denon, we are able to view Dolby Vision content. Our HDMI cables support resolutions up to 8K@60Hz and 48Gbps bandwidth. What is the problem? Why can’t we view Dolby Vision content when using the Denon receiver as a passthrough audio? All HDMI inputs are on enhanced, eArc is enabled. It only seems to not be in Dolby Vision when passing through audio to the Denon?

When playing music from the Spotify app on Apple TV, sound comes out from the Denon AVR and the fly-over sceen saver works in Dolby Vision.. (What's going on)?

I saw the same issue noted from an earlier comment in this forum, however didn't see any solution noted?

Any Ideas?