Search Console issues

I’m having problems with Rank Math Sitemap in all clients where I’m putting the plugin to work.
The sitemap link is active.
I checked the XML Sitemap Validator tool and passed: https://www.xml-sitemaps.com/validate-xml-sitemap.html?op=validate-xml-sitemap&go=1&sitemapurl=https%3A%2F%2Fblogrockpixel. com% 2Fsitemap_index.xml & submit = Validate + Sitemap
I put the suggested code in the .htaccess file, item 5 of the page https://rankmath.com/kb/fix-sitemap-issues/
I installed the Health Check Plugin and didn’t charge anything.
I already checked the robots.txt file.
I’ve already remade the permalinks.
It already deletes the cache.
I already reset the cache on the cloudflare.
But every time I try to read the sitemap in Search Console, it says that the sitemap has been read but is empty.
Follow the link of the current sitemap: https://blogrockpixel.com.br/sitemap_index.xml