Using latest version of Spotify App on Android phone (Note 4). Initially the app wouldn't list any available devices despite reinstalling the app and resetting my router. I then opened the Spotify app on my Desktop and mysterioulsy the Desktop & Samsung phone suddenly were listed under available devices. I also have some Sonos speakers & Logitech Squeezboxes in the house & they are still not listed under available devices. Have no idea why this is. If I go into the Sonos app I can use Spotify but can't find a way to control Sonos or Logitech from the Spotify app. Any ideas how I get them to appear under available devices?