Hello,
Thank you for contacting Rank Math, and sorry for any inconvenience caused.
Could you please check the following:
1. Is the sitemap working fine in your browser? You can check that by going domain(.)com/sitemap_index.xml
If the sitemap is working fine, you can try validating it on this link: https://www.xml-sitemaps.com/validate-xml-sitemap.html
If the validation works, please move to the second point.
2. Make sure you have cleared the cache and excluded your sitemap URLs from being cached.
Once done, resave your permalink and sitemap settings, then resubmit your main sitemap (sitemap_index.xml) on GSC.
If the issue persists, please share with us your sitemap URL in the sensitive section so we can test from our end.
Looking forward to helping you.
Thank you.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.