Multi-factor authentication (MFA): multi-factor authentication is a type of authentication that requires the use of two or more verification factors to gain access to a system. Azure MFA offers a 14 day grace period after being initiated. This period allows users to register before it becomes a requirement after 14 days.

 Multi-factor authentication (MFA): multi-factor authentication is a type of authentication that requires the use of two or more verification factors to gain access to a system. Azure MFA offers a 14 day grace period after being initiated. This period allows users to register before it becomes a requirement after 14 days.

https://www.syskit.com/blog/using-azure-conditional-access-when-security-defaults-isnt-enough/