What is Passkey in Microsoft Authenticator?

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Question

What is Passkey in Microsoft Authenticator?

Answer

A phishing-resistant credential stored in the Authenticator app.

How it works:

  • Uses device-bound cryptographic keys
  • You authenticate using Face ID / fingerprint / phone PIN

Key benefits:

Best for:

  • Users with access to sensitive data
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Microsoft Authenticator - Device-bound Passkey
A device‑bound passkey stored locally in Microsoft Authenticator app on your mobile device is tied to a single device or authenticator instance and does not sync, meaning it must be re‑registered on each new device. It uses biometrics or a PIN to prove your identity and is resistant to phishing while providing tighter control than synced passkey by keeping the credential confined to one device.