Microsoft enabled system-preferred MFA (multi-factor authentication() by default, choosing the most secure registered method,regardless of the default MFA method.
How to get MFA Status from Microsoft Entra — LazyAdmin
System-preferred MFA Enabled by Default in Microsoft 365
Microsoft MFA not allowing Phone as a method. : r/Office365
ISASA – I Suck at System Administration.
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Azure AD System-Preferred Authentication