The Page Analysis may indicate that your website has no Sitemap while you configured a sitemap in Google Search Console.
A website can have several sitemaps. The sitemap file have to be defined in your Robots.txt file :
Sitemap: http://www.website.com/sitemapfile1.xml Sitemap: http://www.website.com/sitemapfile2.xml
You should not indicate more than 50,000 urls in a file.