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My tv is a Samsung QN85QN90AAFXZA. It’s less than a year old and has eArc. 
Hooked up the Arc and 4K AppleTV but don’t get Dolby Atmos showing during playback in the Sonos app…  It reads “Multichannel PCM 5.1”

Known issue?  User error?

Any help would be greatly appreciated  

Thanks!

 

So… my Samsung TV is arc, not earc. How can I get Atmos sound from my Appletv 4k to play through my Sonos Arc? I see the option on the tv for Dolby Digital+ but it is greyed out. Thanks!