Hi ​@Monmon 

Welcome back to the Sonos Community!

The creation of new playlists or the editing of existing playlists are features not yet added to the new Sonos app. As a workaround, you should be able to do so from the Sonos app for Windows or MacOS.

You should be able to play existing playlists, however, assuming the music service they point to is still accessible. Playlists are now stored in the Favourites section, but if they will not play, I recommend you get in touch with our technical support team who have tools at their disposal that will allow them to give you advice specific to your Sonos system and what it reports.

I hope this helps.