On the Xbox One version of Spotify, you can control which songs play, but you cannot put them on repeat from your phone. On the Xbox guide snap you can change volume, skip, and reverse songs but you cannot place them on repeat from here either. It's very cumbersome to go into the Spotify app each time you want a song to repeat while simultaneously playing games.
Hey @AlexinItalics!
We'll be closing this thread since we haven't heard back from you in a while.
Don't hesitate to open a new one if you need us again.
Cheers.