Search engines like google and yahoo don’t index 4XX pages as they don’t do the job. Due to this fact, they’ll dismiss any canonical tags pointing to these kinds of pages and often turn out indexing the wrong (non-canonical) version of the webpage. php file. I should update the canonical link. https://yesbookmarks.com/story18913947/the-definitive-guide-to-automatic-hreflang-tags-canonical-tags-all-pages-seo