Hello,
Thank you for your query. We will be super-happy to help you with your concern.
Your sitemaps are no longer showing a 404 error, it is possible it was a temporary caching issue.
Please follow these instructions if the issue persists on how to solve 404 issues with sitemaps: https://rankmath.com/kb/sitemap-404-error/
We hope that helps and we are here should you have any follow-up questions.
Hello,

We are super happy that this issue is already resolved. If you have any other questions in the future, know that we are here to help you.

If you don’t mind me asking, could you please leave us a review (if you haven’t already) on https://wordpress.org/support/plugin/seo-by-rank-math/reviews/#new-post about your overall experience with Rank Math? We appreciate your time and patience.

If you do have another question in the future, please feel free to create a new forum topic, and it will be our pleasure to assist you again.

Thank you.