I couldn't play any music on the Music app on my iPhone. Even songs I purchased or syced my from my computer. I had to turn OFF iCloud under Music in the settings app. Unfortunately I lost my synced songs so i have to do it again.
I did however plug my phone into my computer and all my songs synced automatically I had chosen the day before. Saved a ton of time. It's also nice to have correct album art again. Apple Music needs more work to catch up with Spotify.