: 14.0 – 15.4.1 (and some 15.5 beta, 15.6 beta) How to use :
If you are using a modified Apple Music IPA (e.g., to remove UI clutter), you may not be able to log in. Apple is very aggressive about blocking modified clients from authenticating with their servers. apple music ipa install
(for example, if it's unavailable in your region) or alternative music players, here is a guide on how to do it. The "Why" Behind Apple Music IPAs Server-Side Security to remove UI clutter)