I also have a Denon receiver, which used to be playable from both my Android phone and laptop, but neither device can "see" it anymore. I've restarted everything, reinstalled Spotify, and confirmed all devices are on the same network, to no avail. FWIW, the receiver isn't visible from the Spotify web player either.
I've been a Premium Spotify customer since 9/2013 and I swear each year it gets worse. This is just one more reason, perhaps the last one, that convinces me to switch to one of the many attractive alternatives out there.
I CAN NOT DOWNLOAD MUSIC IT KEEPS SAYING IM OFFLINE :::(((( I DID EVERYTHING TO FIX IT - NOTHING WORKED ::((( I UN INSTALLED SPOTIFY AND RE INSTALLED IT AND IT STILL SAYS OFFLINE :::((((( AND I LOST MY WHOLE MUSIC LIST ::::((((( I HAVE ALREADY PAID FOR 1 MONTH ALREADY THE PREMIUM AND IT SAYS THAT I DONT EVEN HAVE IT ::::((((( HELP !!!!!