AMP Page URL is noindex
This means that the URL in question is an AMP Page URL, which is noindex.
Why is this important?
If an AMP Page URL is noindex, this gives an explicit directive to search engines that they should NOT index the page, which means it will not end up in search results. Since AMP is designed to be accessed through search results, this defeats the object of creating AMP pages in the first place.
What does the Hint check?
This Hint will trigger for any AMP URL that is noindex.
Examples that trigger this Hint
Consider the AMP URL: https://example.com/page-a/amp/
The Hint would trigger for this URL if it had a noindex directive in the HTML or HTTP header;
Meta noindex in the <head>,
OR in the HTTP header:
How do you resolve this issue?
AMP URLs need to be indexable, in order to be included in search results. So remove any noindex directives from AMP pages, ensuring to check both the HTML and the HTTP header.