Hello, we apologize for the issue you are facing with your sitemap. The message "no referring sitemap detected" typically indicates that there may be a configuration issue with your sitemap settings or that the sitemap is not being generated correctly.
Here are a few steps you can take to troubleshoot this issue:
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Validate Your Sitemap: Use the Validate XML Sitemap tool to check if your sitemap is correctly configured. Enter your sitemap URL and click VALIDATE SITEMAP.

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Ensure the Sitemap is Located in the Root Folder: Make sure your sitemap is located in the root folder of your WordPress installation. The correct URL should look like this: https://yourdomainname.com/sitemap_index.xml.
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Check Index Settings: Ensure that your posts are set to index. Go to Rank Math SEO → Titles & Meta and check the Robots Meta settings. Make sure the Index checkbox is enabled for your posts.

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Flush Permalinks: Sometimes, flushing permalinks can resolve issues with sitemap detection. Go to the Permalinks page in your WordPress dashboard and click Save Changes without making any changes.
If these steps do not resolve the issue, please reply to this ticket with your site URL so we can assist you further. Thank you for raising this concern!
Hello,
Thank you for contacting us and sorry for any inconvenience that might have been caused due to that.
Please note that a sitemap is only one of many ways Google discovers the URLs of your site. If Google discovers the URL through other means, it may not cross-reference your sitemap to check if the URL is there. Hence the “No referring sitemaps” message.
Googlebot may have found the URLs from internal links or possibly from links on another site. It mostly happens when you have good internal linking or use the Instant Indexing plugin.
Here’s a link you can check for more information:
https://rankmath.com/kb/zero-discovered-urls-through-sitemap/
Hope that helps and please don’t hesitate to let us know if you have any other questions.
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.