Hello,
We apologize for the issue you are facing with your sitemap not updating. Here are a few steps you can take to troubleshoot and resolve this issue:
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Check if Your 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 that the Index checkbox is enabled for your posts.

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Clear Cache: If you are using a caching plugin, it might be caching your sitemap. Make sure to exclude the sitemap files from being cached. You can find guidance on how to do this here.
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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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Check for Conflicts: Sometimes, conflicts with other plugins or themes can cause issues. You can use the Health Check plugin to identify any conflicts.
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Rewrite Rules: If you are on an Apache or Nginx server, ensure that the appropriate rewrite rules are added to your server configuration. You can find the necessary rules in our documentation for Apache and Nginx.
If these steps do not resolve the issue, please reply to this ticket with any additional details or errors you may be encountering, and a human agent from our support team will assist you further.
Sources:
Troubleshooting the “Couldn’t Fetch” Error in Google Search Console » Rank Math
Rank Math Sitemap Issues and Their Fixes » Rank Math
This is an automated reply from Rank Math Support Bot. Your ticket has been assigned to a human agent and we will get back to you shortly.
Hello,
Thank you for your query and we are so sorry about the trouble this must have caused.
We have checked your sitemap and we can see it is working properly without any issues:

Kindly check and let us know how it goes.
Meanwhile, if you have any other questions, please feel free to ask.
We are here to help you.