I just wanted to add that I have read multiple threads on here and on the Amazon Alexa community and nothing I have read in either place seems to address or fix this issue. It seems simple enough from what every conversation says, but I have yet to get this to work in any fashion.

Do you group the speakers in the Alexa app or the Sonos app?

Try this… you need to set the Roam and Sonos One as the controlling/enabling devices in the first section of the Amazon Alexa Group called ‘Upstairs’, as well as adding them both to the third ‘speaker section of that group.

Note: A controlling/enabling device can be used in an Alexa group once only, so you need to remove the Sonos One from the first section of the Bedroom group and the Roam also needs removing from the first section of the Bathroom group, but you can leave them in the third ‘speaker’ section of their respective Alexa groups.  

Hope those steps are clear for you to follow.

They are grouped in the Alexa app. Group called "Upstairs" was created the two speakers are added to the group.

Thank you for the response. So, gave this a try, but still now joy.

Goto the two speakers in the Upstairs group and scroll down past your devices to ‘playback options’ (see screenshot attached) and set that to ‘ALWAYS’ then say to the Alexa assistant on either speaker - ‘Alexa play some music’ —→ the two speakers should automatically Group and begin playback.

Thanks, I will give that a try!

I really wish they would make this integration more clean!

You could always use SVC instead of, or aswell as, Alexa. SVC has syntax that allows you to group/ungroup Speakers. I use both, as Alexa will auto-group/ungroup for playback, but SVC has some more specific instructions that can be used.

I have thought about that, but having two different voice controls just seems clunky to me… 

Everything seems to be a work around rather than true integration.  I already had to bail on Google Assistant, because that integration is even worse. Really trying to make Alexa work, but limitations are getting frustrating.

As another Sonos user, like yourself, I initially had some frustrations, but have used Alexa with Sonos for some years now (and of course SVC in more recent times) and now have no issues with it - it’s fairly straightforward once you get your head around how things work. I also use Google too at a holiday home mostly, but I’m not so keen on that assistant as it’s quite limited when it comes to controlling Sonos. It’s a pity that Google do not allow their assistant to work alongside other assistants, as I would add SVC and Alexa and then use all the available assistants on my devices.

How do

How does using SVC and Alexa work together for routines in Alexa. For example I have a good morning routine now that does some things with lights, other things in Alexa, that also starts music. The issue is trying to get that routine to start music in both the bedroom and the master bath. For something like that do you make Alexa call to SVC to start the music? Seems straight forward enough, but also seems like an added layer of complication.

Here are the available SVC instructions you can use…

https://support.sonos.com/en-us/article/list-of-voice-requests-for-sonos-voice-control

Here is some further information about Alexa and the basic instructions you can use with that assistant…

https://www.amazon.com/Sonos-Inc/dp/B072ML3N6K

And just for completion, here are the Google assistant basic instructions… 

https://support.google.com/assistant/answer/7539710

Thanks for that Ken… I will have to play with combining these and see what I can make work.  I am going to try your suggestion of the playback options first and see if that works.