I just got my Sonos Beam. It's setup and working fine as a standalone speaker (I can play music on it through the Sonos App), and it's also working fine as a speaker for my TV (connected via HDMI-ARC). I also have an Amazon Echo in the same room.
I'm trying to power on/off my TV using Alexa. When I say, "Alexa, turn the TV on" she responds with, "Sorry, I didn't find a device named TV." From within the Alexa app, when I select "Add Device," the discovering devices wizard begins but always comes back with "No new devices found."
Best answer by cpressley46
Also, had to enable 1-touch on my TCL Roku TV. Sonos support over the phone helped me with this part.