We are aware of potential issues with discovery of Sonos speakers, or syncing of Sonos Favorites & Playlists, when a Sonos Boost or Sonos Bridge device is present in a Sonos setup.
We unfortunately do not have a bullet-proof way to resolve this issue, but in many cases, temporarily removing the Boost or Bridge device from the setup, running discovery while connected to your wifi network in the Yonomi app, and then re-adding the Bridge/Boost device will resolve the issue.