Hello,
Thank you for contacting Rank Math and sorry for any inconvenience that might have been caused due to that.
Your sitemap is loading fine from my end, check the screencast I have added in the sensitive section. Please test your sitemap in a private browser or with this tool: https://www.xml-sitemaps.com/validate-xml-sitemap.html
It seems your sitemap was last read on 17th August. You can remove and resubmit your main sitemap on GSC if no issues are detected from your browser and give it time for Google to crawl your sitemap.
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.