Issue symptoms
My end users are receiving automatic notification via email in the wrong locale. However, the language in the profile of my end user matches the dynamic content language.
Resolution steps
Languages in end user profiles must be exact matches to the language field of dynamic content variants. If no exact matches are found, the default variant is used. For example, if an end user's language can be set to French - français, but your dynamic content language equivalent is French, no match is found. In this case, the default variant, such as English, for the dynamic content is sent to the end user.
To resolve this, ensure these strings match exactly. Adjust the end user language and the language field of your dynamic content variant.
For more information, see these articles: