Copy SLURL gives you a URL starting "http://maps.secondlife..." where to bring it up in a browser web page it needs "https://maps.secondlife....."
We use web pages with embedded SLURLs and these have started to fail in browsers, by bringing up the security page Redirect Notice since the links are only http and not https as seen here https://gyazo.com/a1125cbe3a843aa3d55c6f8b07612b41 .
I understand the SLURLs were developed before https was even around, but since in-world both http and https work on SLURLs can the back-end be changed to just give us https links when we do a "Copy SLURL"