I’m having the same issue.
If you’re still getting a 404, you might want to add this handsome looking snippet to your .htaccess file. It worked for me.(Copied)
# WordPress SEO – XML Sitemap Rewrite Fix
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^sitemap_index\.xml$ /index.php?sitemap=1 [L]
RewriteRule ^([^/]+?)-sitemap([0-9]+)?\.xml$ /index.php?sitemap=$1&sitemap_n=$2 [L]
</IfModule>
# END WordPress SEO – XML Sitemap Rewrite Fix
Or Changed permalinks and try again
Uncheck then re-check indeed solved that for me.
Hi,
We’re working on cleaning up these Yoast SEO support forums. Since your thread hasn’t had any activity in a very long time, we’ve marked it as resolved.
Of course, you’re always welcome to open a new topic. We kindly ask you to read this post before doing so.
Thanks for understanding!