Help CenterMicrosoft 365How do I set up Multi-Factor Authentication (MFA) in Microsoft 365?

How do I set up Multi-Factor Authentication (MFA) in Microsoft 365?

Enable MFA to protect Microsoft 365 accounts against unauthorised access.

Setting Up MFA in Microsoft 365

### Easiest Method — Security Defaults

1. admin.microsoft.com → Azure Active Directory → Properties

2. Manage Security Defaults → Enable → Save

This enforces MFA for all users automatically.

### Per-User MFA

1. Users → Active users → Multi-factor authentication

2. Select users → Enable

### User First Sign-in After MFA

1. Download Microsoft Authenticator app

2. Scan QR code shown on screen

3. Verify with a test code

### Alternative Methods

  • SMS/Text message code
  • Phone call with approval
  • OATH hardware token

### User Lost Their Phone?

Admin → Users → Manage multi-factor authentication → Delete their registration → User re-registers on next sign-in

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