Hello,
We apologize for the issue you are facing with your sitemap not updating immediately after publishing new posts. This can sometimes happen due to caching issues or server settings.
Here are a few steps you can take to troubleshoot this issue:
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Flush Permalinks: Go to your WordPress admin area, navigate to Settings → Permalinks, and click the “Save Changes” button. This can help refresh the sitemap generation.

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Check Caching Plugins: If you are using any caching plugins, ensure that they are configured to exclude the sitemap from caching. This will help in reflecting the latest changes immediately.
You can refer to our guide on excluding sitemaps from caching.
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Server Resources: Sometimes, slow server response can delay sitemap updates. Check your server settings under Tools → Site Health → Info and ensure your PHP settings meet the recommended values.

If these steps do not resolve the issue, 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!
Sources:
Rank Math Sitemap Issues and Their Fixes » Rank Math
This is an automated reply from Rank Math Support Bot. If you need further assistance, please reply to this topic and a human support agent will reply to you shortly.
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.