You may need to elaborate a bit more @willyt, particularly if you’re seeking some help here from the community. I have a greater number of Sonos products and use quite a few MSP services linked to the App and it seems to be working ok for discovery/playback/control of Sonos rooms and groups. 

Perhaps outline your setup and the describe the issues seen in further detail and then perhaps someone will be able to assist you, or if you prefer, perhaps go onto speak to Sonos Support Staff by contacting them via the link below:

https://support.sonos.com/s/contact