Sonos Apps can't see speakers, but Airplay works

iPhone 15 pro, latest shipping IOS. Sonos app can’t see speakers. Sonos app on Mac can see speakers.. (It wants to update, but fails, but that’s not this post.)

I’ve gone through the walkthrough in the Sonos app (unplug everything, plug back in, etc.) just short of resetting everything. I’m not willing to do that because it works fine if I push music via AirPlay and it’s five speakers and forget that.

The only negative that I can see is that speakers are frozen on whatever firmware version they are at.