Hello,
We apologize for the issue you are facing with tags not showing up in your sitemap. Here are a few steps you can take to troubleshoot and resolve this issue:
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Check Tag Settings: Ensure that the option to include tags in your sitemap is enabled. You can do this by navigating to Rank Math SEO → Sitemap Settings and confirming that the tags are set to be included.

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Custom Canonicals: If you have added custom canonical URLs to your posts, those posts may not appear in the sitemap. Rank Math includes a self-referencing canonical by default, so removing any custom canonicals might help.
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Content Availability: Ensure that there are posts associated with the tags you want to include. If there are no posts under a specific tag, it will not show up in the sitemap.
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Flush Permalinks: Sometimes, flushing permalinks can resolve issues with sitemaps. Go to Settings → Permalinks in your WordPress admin area and click “Save Changes” without making any changes.

If you have checked all of these settings and the issue persists, we recommend replying to this ticket with your website URL so that a human agent from our support team can assist you further. Thank you for raising this concern, and we look forward to helping you resolve it!
Sources:
How to Configure Sitemaps in Rank Math – Best Settings and Tips
I have tried all of these solutions but none does not work and issue still persist.
Hello,
We checked your website and found that the “Tag Archives Robots Meta” was set to Noindex in Rank Math > Titles & Meta > Tags. Also, the “Include in Sitemap” option was disabled in Rank Math > Sitemap Settings > Tags page.
However, we set the tag archives robots meta to index and enabled the “Include in sitemap” option. Now, the post tag sitemap is working properly without any issues. Please check the screenshot in the sensitive data section for reference.
Hope that helps and please don’t hesitate to let us know if you have any other questions.
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.