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If you have not enrolled in MFA by the go-live date, you will be forced to enroll. This article describes the enrollment process for this situation.
If you are replacing your phone, enrolling the new device with Microsoft Authenticator only takes a few minutes.
This article explains how to add Microsoft Authenticator as a new method to an account that has already enrolled in MFA.
Microsoft Authenticator requires a relatively small amount of space for installation. You will need to clear enough to allow the installation.