Immersive Audio Dolby Atmos not showing up
I recently bought the new Apple TV 4K and connected it to my Marantz SR 7015 via high speed hdmi. I noticed I was only getting Dolby Surround when I played Apple TV content that specified Dolby Atmos compatibility. After searching a bit online I found Immersive Audio Dolby Atmos is supposed to show up under Audio > Audio Format but I am only getting the option to change format to stereo or Dolby 5.1. I know this option should remain "Off" but nothing is showing under this. Any ideas how to fix this? Thanks.
Apple TV, tvOS 14