Placing a 4XX HTTP status code for any canonicalized URL has exactly the same outcome as using the noindex tag: Google will probably be not able to see the canonical tag and, hence, can’t transfer “link fairness” to your canonical version. Hreflang tag #one could be the self-referencing entry In https://yesbookmarks.com/story18912433/an-unbiased-view-of-was-ist-canonical-tag