I think the problem is with server permissions.
https://www.admflooringdesign.com/sitemap_index.xml
I created that file through FTP and it worked.
I will add FTP access to the Sensitive Data field after I receive a response for this message.
Hello,
Thank you for contacting Rank Math today.
Please share the FTP access, it does not look like this is fixed after the step. Please note Rank Math generates the sitemap dynamically and thus it is not recommended to have a sitemap on the root of your site.
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.