Unable to sign up
iPhone 5c, iOS 8.4, null
I have too...on both Mac and iPad Air 2....
I have the same thing - on iPhone 6+ and on MacBook Pro and iPad
It seems that this may be a problem for those that subscribed to iTunes match, but didn't renew it. There's another thread somewhere that suggests that this is the problem.
Just waiting for Apple to fix it I guess.
Unable to sign up