Hello,
We apologize for the issue you are facing with the sitemap not being fetched in Google Search Console. Here are some steps you can take to troubleshoot this problem:
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Validate Your Sitemap: Ensure your sitemap is correctly configured by using the Validate XML Sitemap tool. Enter your sitemap URL and click VALIDATE SITEMAP. If there are no issues, it should return a success message.

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Check Sitemap Location: Make sure your sitemap is located in the root folder of your WordPress installation. The 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 be empty. Go to Rank Math SEO → Titles & Meta and ensure the Index checkbox is enabled for your posts.

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Add the Correct Sitemap to Google Search Console: Make sure you have submitted the correct sitemap URL in Google Search Console under Indexing → Sitemaps. If you encounter a "Couldn’t fetch" error, try adding a forward slash before the sitemap URL and resubmit it.

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Check for Plugin Conflicts: Sometimes, other plugins can conflict with Rank Math. You can use the Health Check plugin to identify any conflicts.
If you’ve gone through these steps and are still experiencing issues, 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’re here to help!
Hello,
Thanks for contacting us, and sorry for any inconvenience that might have been caused due to that.
Can you please follow the steps mentioned in the guide below? This should help you to figure out and resolve the issue.
https://rankmath.com/kb/couldnt-fetch-error-google-search-console/
Note: after applying the fix, please try re-submitting your sitemap to GSC to see if that’s working.
Looking forward to helping you.
Thank you.