I have two Sonos speakers set up on Google assistant. When I instruct Google to Broadcast it's says "sorry there are no other speakers connected to your home network"...that's not accurate I have two speakers...one titled bedroom and the other titled family room, both within Google home. I know it's possible, because this worked at my previous home.
MetalGlacier, thanks for the help!
Tiff1, make sure your speakers are connected to the same network and and within 15-20 feet of your router. Also, they should be using the same Google Account. Try rebooting them to refresh the connection.
Keep us posted.
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