You might want to try the standalone Xbox Music app, even though I'm pretty sure that one has a little bullet point at the bottom that says the Microsoft account should match the one you use for your phone. Typically all of the built in features (Music, Games, SkyDrive) are designed to use the primary Microsoft account. If you aren't sharing this account, you might want to contact support and see what they can do to help.
Kind of surprised it works on the Xbox One and Windows 8.1.
http://support.xbox.com/ms-MY/music-and-video/use-music-pass
Tried the standalone music app. No dice even though I log in with the email with subscription. No biggie.
Thank you