MFA stands for Multi-Factor Authentication. It protects Microsoft 365 accounts by requiring more than just a password. This usually means approving a sign-in using the Microsoft Authenticator app, SMS, phone call or another approved method.
Why MFA matters
Email accounts are one of the most targeted parts of a business. If an attacker gets access to a mailbox, they may read private messages, send fraudulent invoices, reset passwords or impersonate your business. MFA makes account takeover much harder.
Common MFA prompts
- Approval request in Microsoft Authenticator.
- Six-digit code from an authenticator app.
- SMS code.
- Phone call verification.
Common problems
- User changed phone and lost access to Authenticator.
- Old number is still registered.
- Sign-in is blocked because MFA setup was never completed.
- Outlook is using an old profile or old authentication method.
Best practice
Every user should have at least one reliable MFA method configured. For business accounts, avoid relying on a single person’s phone where possible. Admin accounts should be especially well protected.
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