Hi,
I have searched a bit but seems I am the first having this issue.
I have 3 Alexa (2 Dot and 1 spot) and 2 Symfonisk-Sonos. I am using Spotify from Android/iOS/PC - the issue is the same.
I am able to group alexa speakers and play (cast) to 1-2-3 of them. I am able to play to one sonos speaker at the time. Although I am not able to play to a group including 2 sonos speakers, or sonos speakers and Alexa.
I have created a group including 3 alexa and 2 sonos, but can’t see it on Spotify.
I have tried to create a Speaker Group (there is a dedicated function in the Alexa app) but in this case I have no chance to add the sonos speakers.
Already tried the standard troubleshooting (uninstall all the apps, disable and re enable sonos skill, restart, clear cache etc.
When asked, Amazon told me that Sonos speakers are not supposed to be compatible witht he multi-room functionality, although reading on the FAQ on Sonos website it seems the opposite
thanks in advance, I hope the issue is clear