Hello,
Thank you for contacting Rank Math and sorry for any inconvenience that might have been caused due to that.
That error is caused due to some cache plugin caching your sitemaps. Which cache plugin are you using?
Usually, if you add the following URLs as excluded in your cache exclusions, the issue should be solved, but if you let us know which cache plugin you are using, we can give you exact instructions:
/(.*)sitemap(.*).xml
/(.*)sitemap.xsl
Looking forward to helping you. 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.
