Why your pages should return HTTP 200 and how to fix broken URLs.
Pages returning 4xx or 5xx errors won’t be indexed and may reduce crawl budget efficiency.
HTTP/1.1 404 Not Found
Make sure the page exists and responds with a 200 status. Use a 301 redirect for removed pages, or remove them from the sitemap entirely. Also check that the page is not password protected, e.g. /dashboard.