Why does Sonos say no selections are available?

Sonos might say no selections are available due to various reasons. It could be because the Sonos system is unable to connect to the music streaming service or the music library. This can happen if there is a network connectivity issue or if the streaming service is experiencing technical difficulties. Another reason could be that the user has not properly set up or authorized the music streaming accounts on the Sonos app. Additionally, if the music library or playlists have been deleted or removed, Sonos may not have any selections available to play.

It seems like if you have “too many” files in a local music library, Sonos just can't cope with it, and shows “No selections are available” any time you try to use it. You have to delete some files to make your library usable again.