A company recently enabled two-factor authentication in order to enhance security.

[References: The following web search results provide more information about allow listing and two-factor authentication:, What Is Two-Factor Authentication (2FA)? | Microsoft Security: This article explains the concept of two-factor authentication, its benefits, and its methods., Change your two-step verification method and settings - Microsoft Support: This article shows how to manage your security verification methods and settings for your work or school account, including how to turn on two-factor verification prompts on a trusted device., 2FA Directory: This website lists all the sites that support two-factor authentication, and the methods they use., , , ]