The only thing that I have found that works so far is to start playing
music on one device, let it play for a few seconds, THEN tell it to play
it on house speakers. I don’t know why, but that works here.
I JUST started having the same issue since adding the Nest Audio speaker
to my group 2 days ago! Everything was fine before! I had a Nest Mini, a
Hub with screen, and an older Nest Home/Hub without screen. I had them
in 2 groups (whole house vs kitch...