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Mistake – Canonical Mismatch Errors

This error occurs when the page has a canonical to a different page.  For example

The page URL is but the canonical tag on the page references a different URL.  In this case it is pointing to the http version.  These are two different pages and they must match.  

<link rel=”canonical” href=””/>

Common reasons for mismatched canonicals.  

  • Canonical To HTTP or HTTPS version
  • Canonical to Trailing Slash
  • Canonical to Parameter
Real example:
In the example below, Chase Bank has a page for Spanish speakers and they have set a hreflang to pair it with the main English home page.  When you go to the /espanol page the canonical on that page tells the search engines to ignore the /espanol page and take the global page.  This will create an error and will result in a return tag error for the Spanish version of the page since the search engine will ignore that URL.
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