A week ago it was working fine. My Airport Express no longer shows in Available Devices. Neither on the Mac desktop Spotify app or my iPhone 6 app. I have deleted and re-installed the iPhone app and restarted the iPhone6. I did install new Airport Express and Airport Extreme firmware updates several days ago- possible culprit? When I goto the iOS Spotify, Settings, Devices Menu, all it shows is: LISTENING ON This iPhone. If I turn on my Marantz receiver, then it shows up as a Spotify Connect device. The Airport Express does work with my desktop iTunes and AirFoil.
iPhone6: iOS 10.2
iOS Spotify App: 126.96.36.19986
Airport Express version: 7.6.8
Thanks for your patience on this one.
The good news is we've now released a new update that should help fix this issue. If you update to the newest version (7.4) that should help.
If you do notice any further issues, try a quick reinstall of the app by following these steps. Should the issue then persist, feel free to post a new Ongoing Issue and we'll take a look into this further.