Hi! Sorry for a late response! Did you try reconnecting to the network your Sonos speakers are on and then restarting the Flic app (menu -> exit)?
Also, make sure your speakers are first configured in the Sonos app. In the Sonos app where all your speakers are listed, make sure the speaker you want to trigger doesn’t belong to a user.
If you've tried all these steps it should work, but if you sill have issues send us an email at support@shortcutlabs.com
Let me know if you get it to work! 🙂