Harrisburg University has policies in place that enforce MFA.
Microsoft Multi-factor Authentication (MFA) creates an additional layer of security when logging into your Microsoft Office 365 account. This additional security is associated with something in your possession, such as a personal smartphone, that would be unavailable to someone who gained access to your Microsoft Office 365 account.
The suggested second method of verification is the Microsoft Authenticator app. The Microsoft Authenticator app helps you sign-in to your accounts by clicking matching numbers on your mobile device. Text messaging (SMS) and voice numbers can also be used as a second method of verification.
To setup, delete or change defaults related to the Microsoft Authenticator App follow the instructions at Multi-Factor Authentication & Microsoft Authenticator Application.
To quickly manage account security methods, visit My Sign-Ins (microsoft.com).
Additional information can be found at Set up the Microsoft Authenticator app as your verification method