Echo Dot Alexa unable to change music on Sonos Playbar, but works with Play 1, Play 3

Hi I just purchased an Echo Dot. I have named the sonos devices in my house as per the guidelines and can control them in all rooms except the playbar in the kitchen. When I say "Alexa" the music goes quiet in the kitchen (and presumably all rooms at present) so it is communicating correctly with the playbar, I can even ask it to stop the music. But if I say "play Radio 2 in the kitchen" alexa says "playing BBC Radio 2 from TuneIn On Kitchen" but nothing happens. Same with playing any music from the Amazon Prime service. It did actually work the first day I had the device, not sure what happened as everything is as it was before.