Sonos has confirmed that there is a problem - see thread in Sonos Nordic Forum

Yeah got that same problem

And still no fix for the bug.

I don't think they care about our little problem.

It’s liable to be a change that needs to be done on YouSee’s side. Sonos’ API is the same for all music providers, they all present data back to the Sonos controller which then presents it to the user. Sonos doesn’t even do any parsing of the data they get back.

It's not the API. it works if you switch to classic search. So Sonos is able to search Yousee.

Its not fixed in the new app and there is no option choosing classic search or revert to the old app. 

Which basically breaks usage of Yousee :(

Same problem. Yousee search broken after new app update :-(

The new app is almost useless. It’s not possible to search at all or browse in services , so you can only listen to music you have saved. Please fix. 
 

To old app how ever works perfectly.