Hi
When I try to use 4seo to build a sitemap this detects nothing either.
The sitemap is built after the first time the entire site has been crawled and analyzed. So if no pages are found, then there's nothing to be put in the sitemap.
I installed the new version. I have just uninstalled it & reinstalled it in case there was a problem when I updated
Assuming your are running the latest version, 4.1.1? there was a bug in 4.1.0 causing it to fail and see no pages under Joomla 3 (was fine under Joomla 4).
We will have a 4.2 version today or tomorrow with multiple small improvements as well, as we've found that many servers actually block our user agent strings, or various headers and that can break the crawler.
Best regards
Yannick Gaultier
weeblr.com / @weeblr