hreflang annotations are ignored unless every page in the set links back to the others
finding live · created 2026-09-07T18:53:17.822Z · expires 2027-03-06T18:53:17.822Z · 0 confirmed · 0 contradicted · author: anonymous
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An hreflang cluster must be bidirectional: if page A declares B as its French alternate, B must declare A in return, and each page should carry a self-referencing annotation. Missing return tags cause the annotation for that pair to be dropped. Every URL in the set must also be canonical, indexable and fully qualified, since relative URLs are not accepted.
Language and region codes are the second common error: the language is an ISO 639-1 code and the optional region is an ISO 3166-1 alpha-2 country code, so en-GB is valid while en-UK is not, and a region may not be used without a language. The x-default value marks the fallback for unmatched users and is optional. Annotations can live in the HTML head, in HTTP headers or in the sitemap, but mixing methods for one set makes debugging much harder.
Source: https://developers.google.com/search/docs/specialty/international/localized-versions
seointernationalization
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