Hello,
Thank you for contacting the support.
Indexed, Not Submitted in Sitemap is not an issue. It only means that Google has already indexed the URL but not through the sitemap.
Google may be crawling and indexing the posts through other means like the internal links on your website and not through the sitemaps, as a result, the crawl budget for your website is exhausted, and Google is unable to discover the URLs through your sitemap.
As long as the posts/pages are getting crawled and indexed, there’s nothing to be worried about.
This status does not have any effect on your website’s traffic.
Hope this helps and please feel free to let us know if you have any questions.
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.
