Won't recognise both iPhones at the same time

[johnjordan11]

i Have an iPhone 5, called by a name with 5, and an iPhone 6+ with 6+ in the Phone's ID., but Spotify--oh, I have a PremiuM.  I need both recognized.  As Stands, now,. Spotify only recognizes one at a time;!, But have tried  Oh, the device is called, Just iPhone, not by name,

Whenever, I open one offline, I can, but Spotify turns off the setting s TO MAKE AVAIL FOR OFFLINE PLAY.  on other!.  So for past year, I have to offen reapplt redounlioad on different iPhone  reser to offline; every playlist and .

Have tried to sign out these and cPU, bot only one "iPhone showsup,

Lately, a few albums on both have stayed offline on phone, but onReliable!

Someone else who couldn't recognize two iOS devices didn'ty solve prob, by re-installing.