Alexa asking to link Spotify Premium Account even though already linked when using Sonos

Not sure if this helps at all but I just recently had this problem few days ago and fixed it just maybe yesterday I wasn't able to play music on my Sonos from the Spotify app on my phone but I could on my tablet and while trying to troubleshoot I opened up the Sonos app on my phone which I knew would play already and went into my settings to check for online updates and it was one of vailable after the update finished I closed it out went back into the Spotify app and was able to select the Sonos and now my music is playing. Hope this helps

Sounds like we're experiencing the same issue: https://en.community.sonos.com/amazon-alexa-and-sonos-229102/alexa-says-spotify-needs-to-be-linked-but-it-is-already-linked-6815395

I have the same issue. Sonos One was playing Spotify perfectly until this morning and now I'm getting the response 'to play Spotify, first link your premium account using the Alexa app'. Help!

Having the same issue, just as of this morning. Worked last night, and nothing changed. Tried to re-register and re-everything.

I have the same issue. Sonos One was playing Spotify perfectly until this morning and now I'm getting the response 'to play Spotify, first link your premium account using the Alexa app'. Help!

Same issue for me. I can use Spotify through the Sonos app, but as soon as I ask Alexa to play something I get the link your premium account message. Seems a Sonos issue though, as when I try it with my Echo Dot, it still works.

I have the same problem, and my system was previously working.
I have a premium Spotify account which is linked in the Alexa app and Alexa will play spotify on it's internal speaker on command (echo) without any problems.
When I say "play Spotify on " then Alexa says "To play Spotify, link your premium account first using the Alexa app." The app is definitely linked as it works on the echo directly.
Alexa commands to play TuneIn Radio also work so when I say "play Radio 1 on " this works straight away implying the link between Alexa and Sonos is working.
I can start Spotify playing through the Sonos app and through the Spotify app too. When I ask Alexa a question while this music is playing she also partially mutes the volume on the Sonos to hear the command. Alexa will also stop Spotify playing with a simple "Alexa - Stop music" command.
This leads me to believe that this is some sort of Spotify authorisation issue to do with Alexa but for the life of me I can't work it out. Has anyone had any experience with how Spotify authorisation works?

I have also tried:
Forgetting all devices and re-discovering in Alexa App
Unlinking and re linking the Spotify Account in Alexa app and Sonos
Disabling sonos and spotify skills and re enabling in Alexa app
All of the above with a full power down of Alexa devices
Logging out all devices from the spotify web account and re-linking.

It's like Alexa is not recognising that it is a Premium Account.

Having the exact same issue here. This has always worked, but this morning I am getting the same response "To play Spotify, link your premium account first using the Alexa app."

It does appear to be an issue only with Sonos. When I ask a Echo or Dot to play Spotify, it works.

Hopefully, Sonos can figure this out quickly.

To Sonos engineers:
Can you tell us how Alexa is able to validate the Spotify account when passing it to it's own speakers but seems to not function if passing it to a sonos speaker?

There might be a system or server failure on the Amazon/Sonos IT Cloud of things.