I am trying to join my husband to my Spotify Premium Family account (my two daughters have been part of the family plan for a couple of years). Every time I send him an invitation he receives the message ' You can't join your own Plan! You’re already subscribed to Premium Family. Now send the link to the person you want to add to the plan. They can log in with their existing Spotify account, or set up a new one'. We have tried numerous times, setting up new accounts wirh different email addresses each time and trying them out but we get the same message each time I send the invitation. Can someone help please?