NOT a cache issue – included in exclusion
Hello,
Thank you for contacting Rank Math and sorry for any inconvenience that might have been caused due to that.
Your sitemap is generated by the Yoast SEO plugin and it is loading fine. Please take a look at this screenshot:

If you want to use Rank Math’s sitemap then please enable the sitemap Module by going to Rank Math > Dashboard > Sitemap > Enable.
We hope that helps. Please let us know if you have any 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.