SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/sec-number-matching

With number matching in Microsoft Authenticator, how do you approve a sign-in?

Enter the number shown on the sign-in screen into the app.

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  1. Reply YES to a text
  2. Enter the number from the sign-in screen ✔
  3. Just tap Approve on any prompt

Why: You must type the number from the screen you are signing in on. That proves you are the one at the keyboard, so a random prompt you did not start cannot be approved by accident.

Huh, didn't know that: Microsoft says users can't opt out of number matching in Authenticator push notifications.

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References

Answer: Enter the number from the sign-in screen. You must type the number from the screen you are signing in on. That proves you are the one at the keyboard, so a random prompt you did not start cannot be approved by accident.

  1. Microsoft Learn: Number matching in Authenticator learn.microsoft.com/en-us/entra/identity/authentication/how-to-mfa-number-match
    they see a number. They need to enter that number into the app to complete the approval.
    Checked 2026-10-10.

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Security & PrivacyIs a password enough?Security & PrivacySomeone calls saying they are Microsoft Support and your PC has a virus. What does Microsoft advise?Security & PrivacySomeone contacts you asking for the two-factor code just sent to you. Per the FBI, who can you give it to?

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