Hello Alcon12,
If you're unable to play items from the Apple Music service, you can first try quitting and reopening the application.
1. From the Home Screen, swipe up from the bottom of the screen and pause in the middle of the screen.
2. Swipe right or left to find the app that you want to close.
3. Swipe up on the app's preview to close the app.
Close an app on your iPhone or iPod touch
You'll also want to make sure you've restarted the device and that it is up to date.
Restart your iPhone
Update your iPhone or iPad
If the items you're trying to play are saved to your library, try playing them directly from the Apple Music Catalog and see if they work there. If they do, remove the items from your library and re-add them.
If you're still unable to play items in the Apple Music service, you'll want to contact Apple to report the issue: Get Support
Cheers!