According to the brazilian Sonos Webpage, the Sonos One works with Alexa. But, in my setup with 2 Sonos One and a Sonos Beam, Alexa does not show up as Voice Service. This is really bad, as it means that I cannot use my Fire TV cube!
It is really frustrating, as the interaction with this device was the primary reason for buying the Sonos system. I feel mislead by Sonos Brazil.
[Yes, I created this topic out of frustration, I feel mislead!]