My Apple TV 4K connected to Sony a80l hdmi 2 and Samsung Atmos soundbar connected to tv earc hdmi3. Native Netflix app on tv can output Atmos signal to soundbar. But Netflix on Apple TV 4K failed to output Atmos signal to soundbar. Tried auto pass through and disabled auto pass through still no luck. The only solution as of now is connect Apple TV 4K directly to my soundbar. Can someone help me how to figure out the correct settings to enable Atmos signal output from Apple TV 4K via tv earc to soundbar? The same configuration was used with my old tv LG GX oled and it was working flawlessly.
If you get Atmos connected directly to the soundbar then the issue isnt on the Apple TV, but on the TV itself, you may need to use the Enhanced Format setting on the HDMI.