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This means that the URL in question is an AMP Page URL, and contains a canonical tag pointing to a URL which is not indexable.
AMP HTML documents are required to have a canonical to the non-AMP equivalent (or a self-reference, if no equivalent exists). If this canonical is pointing to a URL that is not indexable, search engines may not index the AMP URL.
The canonical tag is a mandatory element for AMP pages to be considered valid, and the canonical tag is supposed to point back at the original 'non-AMP' version of the page. If this page is not indexable, this sends a conflicting signal to search engines - increasing the chances that the AMP page will not show up in search results.
This Hint will trigger for any AMP Page URL which has a canonical tag pointing to a URL that is has an indexable status of 'Not Indexable.'
Consider the AMP Page URL: https://example.com/amp/page-a/
The Hint would trigger for this URL if it included a canonical URL,
<!doctype html>
<html amp>
<head>
<meta charset="utf-8">
<title>Sample document</title>
<link rel="canonical" href="https://example.com/pages/page-a/" />
...
</head>
...
</html>where this canonical URL is not indexable. A URL can be not indexable for a variety of reasons:
The canonical on an AMP page should be pointing to a URL that is indexable.
To rectify the issue, you would need to fix the canonical on the AMP page so that it points back to the (correct) non-AMP version of the page, and ensure that this page is indexable.
You would also need to ensure that the non-AMP version of the page has a self-referencing canonical. It should look like this:
For the URL: https://example.com/pages/page-a/
This page defines a self-reference canonical and an AMP page:
<link rel="amphtml" href="https://example.com/amp/page-a/">
<link rel="canonical" href="https://example.com/pages/page-a/" />Then the AMP page has a canonical pointing back at https://example.com/pages/page-a/
<link rel="canonical" href="https://example.com/pages/page-a/" />
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