Placing a 4XX HTTP status code to get a canonicalized URL has the identical effect as using the noindex tag: Google is going to be unable to begin to see the canonical tag and, consequently, can’t transfer “link fairness” for the canonical Edition. Perhaps anyone have built it with GTM https://freebookmarkpost.com/story18697267/tag-hreflang-automatici-e-tag-canonici-seo-an-overview