Search engines like yahoo don’t index 4XX pages since they don’t work. As a result, they’ll overlook any canonical tags pointing to these pages and sometimes end up indexing the wrong (non-canonical) Edition from the web page. Canonical tags aren't the only real strategy to declare a site’s canonical. You should https://bookmarkforce.com/story18905402/the-smart-trick-of-hreflang-not-using-canonical-that-no-one-is-discussing