Hello,
Thanks for contacting us and sorry for any inconvenience that might have been caused due to that.
News Sitemap is a PRO feature and since you are using the Free plugin, you will not be able to use or access that feature. Please upgrade to PRO if you want to use News Sitemap: https://rankmath.com/pricing/
Hope this helps. Let us know if you need any other assistance.
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.