Hello,
Thank you for contacting Rank Math and bringing your concern to our attention.
It’s important to note that, a sitemap is just a backup crawling/discovery mechanism that Google uses to index your site. Even without a sitemap, Google can crawl and index your site URLs.
So you already might get the point that it’s completely okay to see no referring sitemap detected. This just means the same. Google might find your URLs by other means.
Rather than focusing on such issues, I’d suggest you to check for your Google Search Console coverage section to determine any issues reported on your site for initial troubleshooting:
https://support.artlogic.net/hc/en-gb/articles/360016851260-Google-Search-Console-errors-and-coverage-issues
If yes, then please share those with us here, and we’ll be assisting with those with our best effort. You can also use a tool like imgur to share screenshots of those errors with us.
Looking forward to helping 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.