So I am using the S1 app (v11.5) on my Android (v12) and normally when I’m playing any music from my NAS the Sonos controls will show in both the notification bar and on the lock screen. However, when I switch my music source to Spotify, it immediately disappears from the notification area and also doesn’t show on the lock screen. The only way I can see what is playing or jump to the next song is to re-open the application every time.
Likewise, the moment I tap “End Session” to switch back to the playlist, the controls immediately pop back up in the notification area.