Search engines like google and yahoo don’t index 4XX pages since they don’t function. Consequently, they’ll ignore any canonical tags pointing to such pages and often finish up indexing the wrong (non-canonical) version from the web site. 2nd likelihood: Disable this choice. In case the "Blue" mixture of the "iPod Shuffle" https://seobookmarkpro.com/story18834527/5-simple-statements-about-tags-autom%C3%A1ticas-hreflang-e-tags-can%C3%B4nicas-seo-explained