Why sitemap fails

Possible reasons why the sitemap might be flagged as Unhealthy or Prerender

fails to crawl them:

The Sitemap URL is incorrect
- Please double-check the Sitemaps URL
Our crawler might be blocked by a firewall
- Check if your firewall might be blocking our IP addresses or user agents and Whitelist the IP addresses and the user agents if necessary.
The Sitemap does not follow the template of https://sitemaps.org/protocol.html
- Check the sitemap structure and syntax
One or multiple URLs on the Sitemap throw a non-200 HTTP status. For example, 404, one of the URLs does not exist.
- Check the URLs in the list if they return a 200 status.