-|Microsoft Entra multifactor authentication|For details about multifactor authentication-operations data storage and retention, see [Data residency and customer data for Microsoft Entra multifactor authentication](~/identity/authentication/concept-mfa-data-residency.md). Microsoft Entra multifactor authentication logs the User Principal Name (UPN), voice-call telephone numbers, and SMS challenges. For challenges to mobile app modes, the service logs the UPN and a unique device token. Datacenters in the North America region store Microsoft Entra multifactor authentication, and the logs it creates.|North America|
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