Ugh, I was about to pull the trigger and change my OG Xbox One for an Xbox One S for it's 4k Blu-ray playback but it sounds like they are having problems playing certain movies.
The Revenant, Star Trek Into Darkness, Lucy, Deadpool are among 4k discs that won't play.
https://forums.xbox.com/xbox_support/xbox_one_support/f/4269/p/2199719/5748173.aspx