Some of the first users who ran to install iOS 8.4 and start testing the Apple Music observed a little problem: some albums / songs appear as “disabled” on the streaming.
Example:
Screenshot: @HugoBonioloFortunately, fixing the problem very simple:
- Open iPhone Settings and go to General Restries. Enter your password.
- If the feature is disabled, enable it temporarily.
- V at Music, Podcasts & iTunes U and check if the option "Explicit" is enabled. If so, turn it off and on again.
- Return screen Restries and disable the feature if you wish.
There, this should solve the problem for everyone.
(tip from Rafael Farina)
Update · 06/30/2015 s 15:50
Another problem often reported by users is this one:

It apparently has to do with overloading Apple's servers. Here, we were able to activate the ICloud Music Library on the basis of the same insistence, restarting the device, deactivating and reactivating Wi-Fi.
After a few attempts, it was.