This error usually happens when Apple's servers are being slammed; patience and persistence win out. Here's how we got iCloud Music Library to work.
How to enable Music Library on your iPhone and iPad
- Launch Settings from the Home screen.
- Tap Music
- Toggle Sync Library to On.
- Choose if you want to Keep Music or Delete & Replace your library. (I prefer Keep Music so nothing is deleted).
- If you get the error again, dismiss it.
- Repeat steps 3-4 until it works.
You may have to wait a while and repeat, in case the servers are really getting slammed.
iPhone accessories worth considering
Are you heading for a road trip this year? Check out some of our favorite iPhone car accessories:

Belkin Lightning Audio + Charge RockStar ($44 at Amazon)
Belkin's Lightning Audio + Charge RockStar adapter gives you two Lightning ports to use with your iPhone, letting you, for instance, charge your phone through one port while using an audio cable with Apple's Lightning to 3.5mm headphone jack adapter to route audio for maps or music through your car's stereo.

Anker PowerDrive 2 ($10 at Amazon)
Charge two devices at once through the dual USB-A ports on this car charger from Anker. With more than just power delivery in mind, Anker focuses on safety, with features like surge protection, temperature control, and more.
Questions?
Did this fix your problem? Let me know if it works for you!
Updated August 2019: Refreshed for latest iOS and iPadOS.
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