Mix mates site [iOS]

[user-removed]

Hi, I've tried all the day on Mix-mates Spotify site - from browser Safari and Chrome. I can choose two artists but the answer is still the same: "Sorry they're not on Mix-Mates. Try again"
All several time tried, changing artists (famous like Madonna or Coldplay and others) - it doesn't work. No playlist generated

Is there a restriction for Italy (my country) or for mobile devices (iPhone iOS 9.2)?

Can U help me, please

Ty