Bridge, two Play:5, 3 x Play 1. This works nicely - all speakers visible etc.
Have just purchased a Sonos One - and is now trying to add this new speaker.
I select Add Speaker, and it finds the serial number of the Sonos One I want to add.
I then hit the button on the Sonos One as instructed - and then after a while I get the message "Sonos not found".
I have even tried with an ethernet cable to my network (on which the bridge is sitting).
Best answer by Airgetlam
How long did you wait between plugging in the bridge and looking in the controller. I've read in some cases it takes up to 5 minutes (which seems really long to me) for the devices to switch over from their Wifi connection to the SonosNet connection.
The other thing I'd recommend, while you're mucking about with it, is to move all the speakers into the same room with the BRIDGE, at least until they can all be "seen". Once they're working again, then you can move them back to where they really should be living.
And once they can be seen by the controller, I'd recommend deleting the wifi credentials from them. I believe there's a "delete" or "clear" button in the area where you'd normally enter that data. At the end of the day, rather than being on your "mesh" that Ubiquiti creates, you really want your speakers on SonosNet, which the Bridge (or any other Sonos device that connects to your router with an ethernet cable) creates.
I beleive that's the guidance that is in the FAQ these days for mesh networks.