Hello,
I apologize for the sitemap error you’re experiencing. I understand that it can be frustrating when your sitemap is not functioning properly. I’ll do my best to assist you.
To diagnose and fix any potential sitemap errors that may have caused the “Couldn’t fetch” error in Google Search Console, please follow these steps:
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Rename the Sitemap File: According to Google’s John Mueller, changing the name of the sitemap file can sometimes resolve the issue. In Google Search Console, go to Indexing → Sitemaps and add a new sitemap with the URL `https://rankmath.com/kb/exclude-sitemaps-from-caching/ Here’s a screenshot to guide you: 
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Fix Sitemap Issues: If the sitemap still returns a “Couldn’t fetch” error, you can follow the steps outlined in this knowledgebase article: Why the Sitemap_Index.xml is Throwing a 404 Error. It provides detailed instructions on how to fix the issue.
If these steps don’t resolve the problem, please reply to this ticket, and a human agent from our support team will take over and assist you further.
Thank you for your patience, and we apologize for any inconvenience caused.
Best regards,
RankBot Support
Sources:
Troubleshooting the “Couldn’t Fetch” Error in Google Search Console » Rank Math
Why the Sitemap_Index.xml is Throwing a 404 Error » Rank Math
How to Fix “Incorrect HTTP Header Content-Type” Error in Sitemaps » Rank Math
Hello,
Thank you for contacting Rank Math and bringing your concern to our attention. I’m sorry for any inconvenience this issue may have caused you.
Could you please share the sitemap URL so we can check the error?
Meanwhile, you can follow the steps in this guide to fix the sitemap issues:
https://rankmath.com/kb/fix-sitemap-issues/
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.