This is driving me mad now. 
 

I have a pair of Play:1s in my kitchen paired with an Echo Dot. Since the Beeb fell out with TuneIn I can no longer use Alexa to turn on the radio. A Yonomi/Alexa routine worked for a while but ‘Favourites’ seem to have vanished from the Sonos app. Asking Alexa to play ‘BBC Radio 6 Music from TuneIn (thus avoiding the BBC app that will play it on the Dot)’ plays ‘BBC Radio York’ on the Sonos -as does creating a simple Alexa routine. I can’t even ask my Sonos Ones in the living room to play ‘BBC 6 Music in the kitchen’ as that command plays ‘No Scrubs’ by ‘TLC’ from Apple Music for unknowable reasons. 
 

The kitchen is the most likely place for me to find myself without my phone it would seem, and the Sonos app is the only way to make it play. I bought these bloody Play: 1s about three months before they announced the Sonos Ones as well