Relisten No content items available

I don’t use Relisten myself, but it does sound like the service isn’t properly populating the data from their servers to your Sonos speakers. Since you’ve already reinstalled the Relisten plug in, I’d be tempted to do several other things. First, check that you’re not running any port blocking software that might be keeping your Sonos speakers from reaching the Relisten servers. This could be VPNs, work profiles, virus protection, anything that might do port blocking. Then I’d try a reboot of both the Sonos speaker(s) and the router, just to be sure any new DNS information is refreshed. Finally, if none of this works, I would call Sonos Support to discuss it.

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.