Wifi speakers stopped working

For the past few days I have been playing with Syrinscape on my ipad with the sound going to my Sonos speakers using airplay. Today I added a Sonos Roam speaker to my Sonos system. Now when I use syrinscape on my ipad, the sound is only coming from the ipad itself, eventhough I still have the sonos speakers selected as output device in ios. Music from other apps on my ipad is still being redirected to the sonos speakers, just not syrinscape. Anyone any ideas?

Update: same issue on my phone, even after switching off the Sonos Roam speaker and rebooting all devices