What are the most common implementation mistakes with hreflang tags?

Full answer

The three most common implementation mistakes for international hreflang tags are:

1. Missing reciprocal links: Adding hreflang tags to only one language version, without linking back from the other language versions.
2. Missing or incorrect x-default: Not setting an x-default tag to redirect unmatched global users.
3. Canonical conflict: The canonical URL points to a different language version instead of self-referencing.

Any of these three common issues will cause Google to completely ignore your hreflang configuration.