Specify the hreflang code pattern

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From using unsupported values ​​to specifying the country without setting the language or even forgetting to include return tags or doing so in non-indexable URLs, among many others.

International SEO positioning - hreflang notes

In general, these errors usually occur when an hreflang implementation process that includes proper validation is not followed, such as:

Assess the scope of implementation by language and/or country
Identify those language and/or country versions that need to use hreflang, especially those with international search results, that are not aligned and can be prioritized.

Choosing a deployment method
Evaluate the best-fit hreflang implementation method (HTML header tags, HTTP header, or XML sitemap) based on your site and project requirements and existing constraints.


Define the hreflang tagging to be used in the implementation on the different language/country pages.

You can refer to Google's official specification , as well as the supported country and language formats and values, to avoid including them in incorrect locations, or with unsupported tags, attributes, or values.


Tagged pages should be crawled in a test environment before launch to identify potential tagging errors.

Monitoring and troubleshooting hreflang implementation uk phone number list issues after launch
Tagged pages should be recrawled after launch and monitored using the Google Search Console International Targeting report to identify any remaining issues.

You should also initiate ongoing monitoring to identify any issues that arise when publishing new pages, as well as changing or deleting existing ones.