Microsoft enabled system-preferred MFA (multi-factor authentication() by default, choosing the most secure registered method,regardless of the default MFA method.
Microsoft MFA not allowing Phone as a method. : r/Office365
Microsoft Expands Multi-Factor Authentication Methods to Companion
Azure AD System-Preferred Authentication
Teams Real Simple with Pictures: Implementing System Preferred MFA
Office 365 Reports All About Office 365, 47% OFF
Using Multi-Factor Authentication for Office 365
Enable Report Suspicious Activity in Azure AD to Stay Alerted on Suspicious MFA Requests
Azure AD System-Preferred Authentication
How to set up MFA for Office 365 on end-user devices
Office 365 Reports All About Office 365, 47% OFF
Using Multi-Factor Authentication for Office 365
Teams Real Simple with Pictures: Implementing System Preferred MFA
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