Sonos One/Move integration with Alexa appears to not support the AudioPlayer interface, at least not fully. The Alexa skill, "My Media for Alexa", uses this API to stream music, however, when playing a list of songs, Sonos plays only the first one in loop. Asking Alexa to play next song works, so it seems it is the play from one to another that does not work correctly.
I contact Sonos Web support and basically the answer was that Sonos does not support 3rd party Alexa skills. This is well and good but for example Amazon echo support this skill fully.
So it would be great that Sonos is looking to fix that as "My Media for Alexa” skill is the only one works fully by using a local music library (the Plex skill is very buggy in comparison).
So please Sonos, look into that
Best answer by Corry PView original