I set up the Sonos One two weeks ago and it connected fine to our existing Sonos system. Alexa voice was also working well. The Sonos One was unplugged for several days, and when I started it back up, Alexa did not respond, It appears that the voice services in the Sonos and Alexa apps on my Android phone are active. The system plays music just fine via the Sonos app.
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Another note. Prior to this fix, I could say "Alexa, play music" and she would respond with something like, "Here's a song i think you might like...." and then dead silence. She could, however, tell me the weather.
To tag onto this issue..... I disabled sonos skill and re-enabled and that worked to some degree! Thanks Chris. So far only the Sonos One will work with a voice command. When I tell Alexa to "add living room" she doesn't know what I'm talking about. The various rooms do show up in the "smart home" section of the Alexa app because I did add them. They appear to be enabled and they do all work via the sonos app. I appreciate any help as I've worked on this for hours and hours.