Check and see if Dolby Atmos is on the second audio option?
For some reason I had the same issue with my 4K discs and my receiver playing DTS X as the default with the Dolby Atmos option as the alternative in the audio options.
Saw someone on Reddit post this, couldn't believe it's finally on sale.
Condemned for $5
http://marketplace.xbox.com/en-US/Product/Condemned/66acd000-77fe-1000-9115-d802534507d2?nosplash=1
Worth a shot, any new Xbox One Destiny players looking to do this feel free to add me. :)
Xbox One Gamertag: Lost Toasty
Here's my referal link: https://www.bungie.net/en/ReferAFriend?code=RAF-NR4-CDG-Y6V
Backup links (just in case) ...
Just got Ganondorf and Olimar via Walmart too! Order is already processing, available for pick up this coming Monday.
All that's left now is Bowser Jr. :D