Engines like google don’t index 4XX pages mainly because they don’t operate. As a result, they’ll dismiss any canonical tags pointing to this kind of pages and sometimes turn out indexing the wrong (non-canonical) Edition of your web site. Should you be using a CMS like WordPress, Joomla, or another System, https://addons.prestashop.com/es/seo-posicionamiento-buscadores/31857-google-rich-snippets-automatico-json-ld-opengraph-seo.html