Hello,
Thank you for contacting Rank Math and sorry for any inconvenience that might have been caused due to that.
It seems that you’re currently using the Rank Math PRO plugin, but the account you have used to open this ticket is the Rank Math free version.
Can you please search and forward a receipt from FastSpring.com so we can locate your account and verify it?
Back to your issue, I checked your sitemap and seems like now it is loading perfectly without any issue.

However, I can see that one of your sitemap variations isn’t redirecting to your final variation. Please refer to the screenshot below:

Please note that all 4 URL variations of your sitemap should redirect to 1 preferred variation.
Please refer to our guide here in this issue: https://rankmath.com/kb/couldnt-fetch-error-google-search-console/#num-5-2-ensure-sitemap-is-accessible
After doing, please clear your website cache and submit the sitemap again to your Google Search Console.
Let us know how it goes. 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.