SmartCrawl Pro sitemap 404

My sitemap URL is returning 404, I believe it is a rewrite for Nginx but I already tried

location ~ ([^/]*)sitemap(.*).x(m|s)l$ {
rewrite ^/sitemap.xml$ /wp-content/uploads/sitemap.xml permanent;
}

rewrite ^/(.*/)?sitemap.xml /wp-content/uploads/sitemap.xml last;

But no luck, can you help me?