I recently bought the Sonos One on a trip to the US. Am now setting it up back in the UK. Have synced it to my Sonos system and it now shows up on my iPhone app. The app now prompts me to 'Add Amazon Alexa'. When I click this it says 'Your Sonos system requires an update'. When I click 'Update Sonos' it says 'Unable to update Sonos app... A Sonos update has been released but is not yet available in your app store'. Can't get any further than that but am sure I have the latest app, and that Alexa should be enabled in the UK?