I recently bought a Roam and added the Google Assistant. On all my other google assistant enabled devices (non Sonos) I can ask for BBC Radio 4 to be streamed and it works. If I ask the Roam for the BBC Radio 4 stream I get BBC Radio 4 Extra from Tunein.
I have the BBC Sounds Service added to my configuration. All the BBC streams on Sonos come from Tunein. Only hand crafted BBC Sounds shortcuts work natively on Sonos as I’m set up at the moment. Tunein is still available as a service.
I know BBC Sounds is still in pre-view too. Is this the problem and should I be more patient :-)