Have you contacted YouSee to ask them? 

On the Sonos side, I’d be tempted to do a network refresh to pick up any possible DNS issues, if there were any. Just unplug/power down your Sonos devices, and reboot your router. Wait a couple of minutes, then power back on your Sonos devices, giving them a couple of minutes to reload before testing.

But I’m not convinced that will really help. Given the history of YouSee, I expect the difficulty is on their server support for Sonos, especially, as you say, your Spotify connection is working. I’d expect that the above procedure has less than a 5% chance of making any difference…but it is something you can do. 

After that, I would recommend that you submit a system diagnostic within 10 minutes of experiencing this problem, and call Sonos Support to discuss it. But don’t post the resulting diagnostic number here, they get sensitive about GDPR.

There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution.

When you speak directly to the Support staff, they have tools at their disposal that will allow them to give you advice specific to your network and Sonos system.

I see in Sonos support an alert that says Sonos service issues. They are saying there is a major outage in their cloud service. They show all the streaming music services as operational but anything I try to get to Amazon or Pandora for example doesn’t work.

the time stamp on their outage alert is 7 hours ago.

But YouSee shouldn’t be going through Sonos’ cloud service, should it? The controller should be telling the speakers to connect to YouSee’s servers directly, shouldn’t they? 

Sorry I don’t know anything about YouSee. I didn’t think music on my phone should be affected by a cloud outage should either. But noting was working.

just now my connectivity issue changed and everything seems to be working now. It was all down for about 7 hours.

Their app works fine on my phone without any disconnects so it seems like something between their services. 
I will try and contact YouSee Musik and also send the diagnostics to Sonos when I see the issue next time. The issue have been there for some weeks so I don’t think it is because of the current outage. 

Note that the server used to feed Sonos speakers is different than the one they use to feed your phone. Hopefully, you’ll get a good response when talking to them. 

I talked to Sonos and they are aware of the issue and try to fix it. No ETA. I also raised it to YouSee Musik. 
 

Thanks for your replies

This is still an issue. Is there any updates to this?

I Think the issues might persist due to the login being used somewhere else. I have not been logged off for a few days