A Sonos One in each kid's room... working via voice command from one Spotify account?

I was thinking about this too. I can’t see that Sonos is really the right product for your use case unless you were looking to build an entire home solution and this was the first purchase to build out the platform.

OK, Chris, that simplifies. We'll give it a go... two alexa accounts, with unique spotify accounts hanging off a common spotify family membership, one sonos system, two kids... feels like an epic experiment... it will either be blissful or just suck my time and remaining hair from my head.

The other option you can try is setting up a different network on your router. Mine has two by default so I couldn’t tell you how to set it up. It might cause some interference from time to time but one speaker on each shouldn’t be too troublesome. Seems like a lot to go through, when you could just purchase two echos.
But again my guess is they will fix this fairly soon. (Hopefully)

OK, Chris, that simplifies. We'll give it a go... two alexa accounts, with unique spotify accounts hanging off a common spotify family membership, one sonos system, two kids... feels like an epic experiment... it will either be blissful or just suck my time and remaining hair from my head.

The relationship between your Amazon and Sonos Accounts must be a 1:1 so this won't work unfortunately.

You have two options and the more I think of this, the more I think Voice Control isn't the way to proceed:

Option 1/ Create 2 Wi-Fi networks (Required to enable 2 Sonos systems to exist in the same house), 2 Sonos accounts and 2 Amazon accounts (To maintain the 1:1 link). In this scenario, you also wouldn't be able to play music across both rooms. But you would be able to control via voice control and not have multiple units ducking;
Option 2/ Set-up as a normal Sonos set-up with a single Sonos and Amazon account and both of your kids control the Sonos Ones via the app and then control via voice control OR use voice control to initiate a common music source and accept that when either of them asks Alexa a question both Sonos Ones will duck.

Well, it *seems* to be working. one sonos system, two unique amazon accounts, one spotify family plan with "child" plans associated with the two unique amazon/alexa accounts. one hiccup was... not only did I need to log in to new acct with Alexa app, I also needed to logout of "amazon shopping" and log in with new account... this way the Sonos One would associate with the right amazon account. then, made spotify the default music player for each. one is current playing Michael Jackson (via Spotify) and the other is playing Wailin Jennies (via Spotify). I'll go give each some voice commands now, with all apps on my phone shutdown, make sure it's controllable. (I won't be able to test "ducking" now since I'd need another set of ears to test that.)

hmmm... it seems to mostly work. the sonoses seem to get a little confused sometimes. like now, when I try to say, "Alexa, pause" or "Alexa, next" to one of the speakers, I only get a "I'm not sure how to help you with that" answer, as though no music were playing (and I can clearly hear it playing!). another time, asking one speaker to do something seemed to cause the other to stop playing. But... 80-90% of the time, it's all doing what I hoped. we'll do some more real world testing later... perhaps on Xmas day. I'm confident this is "good enough" for now, and expect Sonos & Spotify & Amazon to continue to hammer out these (system?) bugs.

hmmm... it seems to mostly work. the sonoses seem to get a little confused sometimes. like now, when I try to say, "Alexa, pause" or "Alexa, next" to one of the speakers, I only get a "I'm not sure how to help you with that" answer, as though no music were playing (and I can clearly hear it playing!). another time, asking one speaker to do something seemed to cause the other to stop playing. But... 80-90% of the time, it's all doing what I hoped. we'll do some more real world testing later... perhaps on Xmas day. I'm confident this is "good enough" for now, and expect Sonos & Spotify & Amazon to continue to hammer out these (system?) bugs.

This is the behaviour that I expected, I expect it will get worse when both speakers are given commands at the same time and you may find that they will only play a single song and then stop. 😞

I also couldn’t get this to work with Spotify, but interestingly, multiple Sonos Ones with independent voice control works perfectly with Pandora. Add to that the ability to tune Pandora radio stations within the Sonos app and what I perceive as the smartest learning algorithms, I’m about to start giving Pandora Premium my money.

Doh. Works perfectly on the free version of Pandora, I haven’t tried Pandora Premium, but this makes me believe it will not work: https://help.pandora.com/customer/en/portal/articles/1392219-%22someone-else-is-listening-to-your-pandora-account%22

Would be interesting to learn if anyone can confirm. Thanks.

Wanted to give an update. Now have a Spotify Family plan, with the two Sonos One's set up on unique Alexa/Amazon Accounts linked to unique "children" of the Spotify Family plan. It works at least 90% of the time, perhaps closer to 95% or 98% of the time. the worst thing is occasionally when asked to play a playlist or an album or an artist, only one song is queued up. Although this might be a lingering issue for Sonos One's in general, not constrained to an issue with our more complicated configuration. The kids have a list of albums/artists/playlists/songs they like, and are continuing to add to the list... seems to be a good way to invoke music you like, with the written queues to remind you of what is possible! (kind of like perusing the old CD rack...)