Hello,
We apologize for the issue you are facing with your sitemap submission to Google Search Console. Since you’ve already checked several important aspects like the robots.txt file, HTTP headers, response code, and caching, here are a few additional steps you can take to troubleshoot the problem:
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Validate Your Sitemap: Use a sitemap validation tool to ensure that your sitemap is correctly configured. You can use the Validate XML Sitemap tool for this purpose.

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Flush Permalinks: Sometimes, flushing permalinks can resolve issues with sitemap accessibility. Go to Settings → Permalinks in your WordPress dashboard and click Save Changes without making any changes.

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Check Sitemap Location: Ensure that 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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Ensure Posts Are Set to Index: If all your posts are set to noindex, your sitemap will appear empty. Check this by going to Rank Math SEO → Titles & Meta and ensure the Index checkbox is enabled for your posts.

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Exclude Sitemap from Caching: Make sure that your sitemap is excluded from any caching mechanisms you may have in place. You can refer to this article on excluding sitemaps from caching for guidance.
If you continue to experience issues after trying these steps, please reply to this ticket with your site URL so that a human agent from our support team can assist you further. Thank you for raising this concern, and we hope to resolve it soon!
Sources:
Troubleshooting the “Couldn’t Fetch” Error in Google Search Console » Rank Math
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.