Should you have several language or country variations you mark up with hreflang, then Each individual of those variations ought to have a canonical tag pointing to itself. There are three ways to add hreflang tags to webpages (by insert, we don’t mean put into practice, we’ve previously coated that):  https://socialevity.com/story20607226/helping-the-others-realize-the-advantages-of-hreflang-canonical