Hello,
We apologize for the issue you are facing with your sitemap not reflecting all your pages. Here are a few steps you can take to troubleshoot and potentially resolve this issue:
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Check Index Settings: Ensure that all your posts and pages are set to index. You can do this by navigating to Rank Math SEO → Titles & Meta and confirming that the Index checkbox is enabled for each post type.

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

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Check Sitemap Settings: Make sure that all post types you want included in the sitemap are checked in Rank Math SEO → Sitemap Settings. If any post types are excluded, they won’t appear in the sitemap.
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Validate Your Sitemap: Use the Validate XML Sitemap tool to check if there are any issues with your sitemap configuration.

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Check for Caching Issues: Ensure that your server-level cache or any caching plugins are not interfering with the sitemap generation. You may need to clear the cache again after making changes.
If you’ve tried all these steps and the issue persists, we recommend replying 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 for you soon!
Sources:
Why the Sitemap_Index.xml is Throwing a 404 Error » Rank Math
Rank Math Sitemap Issues and Their Fixes » Rank Math
Troubleshooting the “Couldn’t Fetch” Error in Google Search Console » Rank Math
Rank Math Sitemap Issues and Their Fixes » Rank Math
Hello,
We’ve already replied to your other ticket on this issue. Please refer to this ticket:
https://support.rankmath.com/ticket/sitemap-count-not-increasing-2/?view=all
We are closing this ticket to avoid duplicate replies.
Looking forward to helping you there.
Thank you.