I get the same message and all the options I see are about getting a family or student plan. Did you manage to solve it?
I have a subscription which expires in July and can't get it, other people subscribe for one month and get it? I'm kind of upset, thinking about writing an email and switching to Amazon if I don't get it.
It is because I paid with a pre-paid gift card. Spotify sucks, come July will give prime a try.