Thats exactly what brought me to this post. And the posts from Guy1337 worked. Just may take a couple of times. What I did exactly: settings, iCloud, Sign out. It will give you a warning that all of your saved stuff will disappear, but as long as you have it saved on the cloud you are cool. Once signed out, I went to settings, iTunes and App Store, and signed out as well. Next, go to your apple music app and sign out of your account there as well if this hasnt already been done for you from the last couple of sign outs of the cloud. Then close the music app. in this case, shut down your candy crush too. No need to hard reset the phone or anything crazy. Now just sign back in to iCloud in both of the spots you signed out of, then open the music app and sign in using your apple id that you use on your phone. Then sign back into candy, try a purchase, and you should be good. That's exactly what I did, and it worked like a charm. Hope this helps!