I was not able to broadcast from or to Sonos beam with google assistant. Suggestions on similar threads have been not effective in solving the issue. I got said there are no speakers associated with this account, in response to tentatives to broadcast from Sonos beam.
The solution is to have exactly the same address associated with the Sonus beam and google home account including street number. Originally they were a little different.
Once I set the same address the issue is solved.