On June 14, 2018 at 10:11, tomciara said...
Reread the post.
Connect the cable to Eero – will not connect. Looks for the nearest mesh Eero and connects wirelessly. Sonos - same thing.
Between "Recently the pool house had some issues..." and "Today, it wouldn't connect..." is "At some point, a cat5e was run from the Comcast gateway in the house, approximately 100 ft to the pool house."- What happened between "recently" and today", and when was "at some point"?
You have the Comcast set up in bridge mode, a switch, then several Eero that are wire, with one using WiFi, right? What happens if you disconnect the one using WiFi?
My notes from Eero training are in my van, but I'm pretty sure the trainer addressed this kind of problem. Did you use their app to see the signal from each AP and are either of the Sonos wired to the AP that's near the Pool House?
Have you tried to connect a laptop to the Cat5e, to see if it's providing a good connection, speed and throughput?