Emails are sent in the same language in spite of the rule in Select Email Message Locale scenario.
SAP SuccessFactors Onboarding
Currently it is impossible to send an email in different languages since the application sends a single email to all recipients.
KB article 3006185 - [ONB 2.0] Select Email Message Locale" rule scenario for multiple locales
email, locale, rule, language , KBA , LOD-SF-OBX-NF , Notifications Framework , Problem