I used to group all these together as Airplay, but now Sonos One is not showing up as airplay option any longer. I have reset Nucleus and Sonos, but still no luck. It does show up in “Other network devices” as “via Sonos streaming” so I can play through it individually.
Apologies for the delayed response here, are you still seeing this issue at the present time? Have you tried rebooting the Core, Sonos device, or networking gear to see if that helps?