What it checks
noindex is the directive that asks for a page to be kept out of search results. It can live in two places: the robots meta tag in the page's head, or the X-Robots-Tag response header sent by the server. The tool checks both.
Why it matters
Google drops a page that says noindex on its next crawl. The usual cause is an SEO plugin setting left on from staging, or WordPress's "Discourage search engines from indexing this site" box. Nothing on the page looks different, so the site seems fine.
How to fix it
- In WordPress, untick "Discourage search engines from indexing this site" under Settings > Reading.
- In your SEO plugin (Yoast, Rank Math and so on), check whether the page or its content type is set to noindex.
- If the page itself has no tag, look for an X-Robots-Tag header in your server or CDN settings.
- Once fixed, request indexing with Search Console's URL inspection tool.