I successfully added a Beam to my current home setup a week ago. However, when I had to reset the router, the Sonos app could not find any speakers. I re-established connection with the other speakers by using an ethernet cable to a Play:1 - but the Beam did not show up. All other speakers showed up on the app.
I ran through the "Add speaker" in the app again, tried ethernet cable, but still no Beam. The light on the Beam is steady white. When I unplug the Beam, and plug it back in, the light blinks white, then becomes solid white.