Core and Sonos

I want to use my Core as a music source for my Naim and Sonos equipment. When configuring the Sonos music library and entering the Core IP address I get a black screen with the search bar at the top. In front of the IP address it states not secure. If I try to browse in the Sonos music Library setup to find the Core tracks I can click on This PC, then Naim Core, then All Music, then Albums, and it opens all the Albums as thumbnails with a description. At the bottom of the box it says OK or cancel. Unfortunately OK is greyed out and can’t be accepted. Any ideas? Bill. PS. I am using Windows 11