Suddenly, for about a week ago, my Spotify would not play on my Sonos-system anymore. Spotify works fine anywhere else, and Sonos work fine with everything else.

Now, I've been in touch with Sonos, and so far they haven't been able to find out what's wrong. 

Last development is that they want me to get confirmation from Spotify that I indeed has a Premium account, since Sonos and Spotify only works with Premium-accounts.

I have a Spotify Family account, wich I thought would be just fine, and it was fine up til a week or so ago. But could that be the problem? Will Sonos no longer work with Family-accounts? Only Premium?