Hello,
Thank you for contacting Rank Math support, and sorry for any inconvenience that might have been caused due to that.
The Web Story URL is currently showing a 404 page.
1. Flush the Sitemap cache by following this video screencast:
https://i.rankmath.com/pipRDp
2. Exclude the Sitemap files of the Rank Math plugin in your caching plugin. The cache could be via a plugin or from the server. For plugins or Cloudflare, please follow this article:
https://rankmath.com/kb/exclude-sitemaps-from-caching/
3. Remove all your sitemaps from your GSC and submit only the primary sitemap (https://yourdomain.com/sitemap_index.xml). See if the issue goes away after doing so.
If the issue persists, let us know so we can further help you troubleshoot it.
Looking forward to helping you.
I did everything as you said but my problem is not fixed
Hello,
Your web story sitemap is loading properly now.

Please wait for Google to crawl the sitemap again and then check the sitemap in your GSC account.
Hope this helps.
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.