@fido, thank you for confirming that you indeed attempted to connect through the supported devices option.
I attempted to re-create your symptoms with your setup to no avail, I was able to factory reset, remove/re-add the two speakers to Sono’s App and they were re-added to Smart Things App as seen below. After setting up in the Sonos S2 App to my network the Scan Nearby option automatically detected it as seen below:
Are the devices located near your router for the best signal? Have you tried resetting up in the Sonos S2 app connecting the Play 1 device to ethernet and attempting to discover?
You can switch between the device network setup using the below steps:
Open the Sonos S2 app for iOS or Android.
From the Settings tab, press System > Network > Manage Networks.
Press Update Networks and follow the prompts to connect Sonos to your Wi-Fi network.
Once the wireless setup is complete, disconnect the Ethernet cable from any Sonos products wired to your router.
As I was able to add both speakers using all methods, I’d recommend reaching out to Sonos if the symptoms persist after a factory reset attempt. I wanted to provide you with their customer support information and product troubleshooting:
Sonos Support Fix an Issue.
1 (800) 680-2345
I hope this message finds you well!