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Identity Authority
Category: Customer Identity

Passwordless Registration

Also known as: Passwordless Enrollment, Passwordless Credential Registration
Simply put

Passwordless registration is the setup step where a user establishes a way to sign in that does not rely on a password, such as a phone authenticator app or a security key. Once registered, the user can later log in to applications using that method instead of typing a password. It is the enrollment phase that must happen before passwordless sign-in can be used.

Formal definition

Passwordless registration is the enrollment process that provisions a non-password credential a principal will later use for authentication, distinct from the runtime sign-in event itself. In the deployments described in the evidence, this typically involves binding a possession-based authenticator, such as the Microsoft Authenticator app performing key-based authentication, to a user's account so that subsequent logins verify identity without requiring a password or knowledge-based security questions. The evidence provided defines passwordless authentication broadly (any login method not requiring a password) but does not specify a standardized registration protocol, ceremony, or version detail; the exact registration flow, credential type, and cryptographic binding depend on the vendor and configuration and are otherwise out of scope for this evidence.

Why it matters

Passwordless registration is the foundational enrollment step that gates whether a user can ever authenticate without a password. Because the evidence defines passwordless authentication as any login method that does not require a password or knowledge-based security questions, the security posture of the eventual sign-in depends heavily on how the credential was established during registration. If enrollment is weak or improperly verified, the resulting passwordless credential inherits that weakness, meaning the registration phase deserves the same scrutiny as the runtime authentication event it enables.

Separating registration from sign-in also clarifies where different risks live. Registration is a one-time (or occasional re-enrollment) provisioning event that binds a possession-based authenticator, such as the Microsoft Authenticator app performing key-based authentication, to a user's account. The subsequent sign-in is the recurring runtime event that relies on that binding. Treating these as distinct lets teams reason clearly about which controls apply where: identity proofing and verification belong to registration, while credential validation belongs to sign-in.

For organizations moving away from passwords and knowledge-based security questions, getting registration right is a prerequisite rather than an afterthought. The evidence does not specify a standardized registration protocol, ceremony, or cryptographic binding, so the exact assurance a deployment achieves depends on vendor and configuration choices made at enrollment time.

Who it's relevant to

IAM Engineers
Engineers configuring passwordless sign-in must first design and operate the registration flow that binds a possession-based authenticator, such as the Microsoft Authenticator app, to each user's account. Because the evidence does not specify a standardized registration ceremony, engineers should confirm the exact enrollment behavior and credential type against their chosen vendor's documentation.
Security Architects
Architects evaluating a move away from passwords and knowledge-based security questions need to treat registration as a distinct control point from runtime sign-in. Decisions about how the passwordless credential is provisioned during enrollment shape the assurance of every subsequent login, and those details vary by vendor and configuration.
System Administrators
Administrators supporting services that rely on passwordless sign-in, for example Azure or Microsoft Entra accounts using the Microsoft Authenticator app, handle the practical enrollment of users and any re-registration when a device or authenticator changes. Understanding that registration must happen before passwordless sign-in can be used helps them troubleshoot access issues correctly.

Inside Passwordless Registration

Authenticator Enrollment
The step where a user binds a new authenticator (such as a FIDO2/WebAuthn credential or passkey) to their identity. During enrollment, a public-private key pair is typically generated, with the private key retained by the authenticator and the public key registered with the relying party.
Identity Proofing Prerequisite
Passwordless registration presupposes that identification and identity proofing have already established who the principal is. Registration binds an authenticator to an already-verified identity; it does not, by itself, prove the real-world identity of the enrolling person.
Attestation
In WebAuthn/FIDO2 flows, an optional attestation statement can convey information about the authenticator's provenance or model to the relying party during registration. Whether attestation is requested or validated depends on the relying party's configuration and policy.
Public Key Credential Storage
The relying party stores the registered public key and associated credential identifier so that subsequent authentication ceremonies can verify signatures produced by the authenticator. No shared secret equivalent to a password is stored.
Recovery and Fallback Enrollment
Provisioning of backup authenticators or recovery mechanisms at or after registration, so that loss of a single authenticator does not permanently lock the user out. The design of recovery flows varies significantly by deployment.

Common questions

Answers to the questions practitioners most commonly ask about Passwordless Registration.

Does passwordless registration mean the account has no password at all, ever?
Not necessarily. Passwordless registration refers to enrolling a user with a non-password authenticator (such as a FIDO2/WebAuthn credential or a passkey) as the primary means of authentication. Depending on the deployment, a password may still exist as a fallback or recovery mechanism, or the account may be genuinely password-free. The term describes the enrollment of possession- or inherence-based authenticators; whether any knowledge factor remains is a configuration choice, not something the term itself guarantees.
Is passwordless registration the same thing as multi-factor authentication (MFA)?
No. Passwordless registration concerns how a user enrolls a non-password authenticator, while MFA concerns how many distinct factor categories are verified during authentication. A passwordless authenticator can be single-factor or, in the case of a device-bound authenticator that also requires a PIN or biometric to unlock, can satisfy multiple factors in one gesture. Passwordless and MFA are related but distinct concepts: a passwordless flow may or may not be multi-factor depending on the authenticator and how it is configured.
How do you handle account recovery when a user has registered only a passwordless authenticator?
Recovery typically requires an alternate enrollment or verification path, since there is no password to reset. Common approaches include registering multiple authenticators at enrollment (for example, a platform passkey plus a roaming security key), issuing recovery codes, or falling back to an identity-proofing or helpdesk workflow. The specific mechanism depends on the deployment and its assurance requirements; recovery design is often the hardest part of a passwordless rollout and should be planned as part of registration rather than afterward.
What is the role of attestation during passwordless registration?
During FIDO2/WebAuthn registration, attestation can allow the relying party to obtain information about the authenticator model or its security characteristics before accepting it. This lets deployments enforce policies such as requiring hardware-backed or certified authenticators. Attestation handling varies by configuration and platform, and some deployments deliberately request no attestation for privacy reasons. Whether and how attestation is used depends on the relying party's policy and risk tolerance.
How can users register more than one passwordless authenticator, and why is that recommended?
Most WebAuthn-based systems allow a user to enroll multiple credentials against the same account, typically by repeating the registration ceremony while authenticated with an existing credential. Registering more than one authenticator, such as a platform passkey and a roaming security key, is commonly recommended so that loss of a single device does not lock the user out. The number and types of authenticators permitted depend on the relying party's configuration.
Can passwordless registration be integrated with existing provisioning and lifecycle processes?
Yes, though the enrollment of authenticators (a runtime credential-binding step) is distinct from identity governance and administration concerns such as provisioning accounts via SCIM or performing access reviews. In many deployments the account is provisioned first, then the user completes passwordless registration to bind an authenticator to that established identity. Coordinating these steps, including deprovisioning that revokes registered authenticators, depends on how the IGA tooling and the authentication layer are integrated in a given environment.

Common misconceptions

Passwordless registration verifies the user's real-world identity.
Registration binds an authenticator to an identity that must already have been identified and proofed through a separate process. Enrolling a passwordless credential is an authentication-setup step, not identity proofing, and the assurance of the resulting credential is only as strong as the proofing that preceded it.
FIDO2, WebAuthn, and passkeys are interchangeable terms for the same thing.
They are related but distinct. WebAuthn is the web API specification, FIDO2 refers to the broader set of specifications including WebAuthn and CTAP, and passkeys are FIDO2/WebAuthn credentials, often discoverable and synchronizable across devices, rather than a separate protocol. The correct term depends on the layer being described.
Passwordless registration eliminates the need for account recovery planning.
Removing passwords does not remove the risk of authenticator loss. Without well-designed recovery or fallback enrollment, a lost or broken authenticator can lock users out, so recovery remains a first-class concern in passwordless deployments.

Best practices

Ensure identity proofing occurs before or as a defined prerequisite to registration, and keep the proofing step logically separate from authenticator enrollment so credential assurance can be reasoned about clearly.
Encourage or require enrollment of more than one authenticator during registration to provide a recovery path, and design fallback flows that do not silently reintroduce weaker password-based access.
Decide deliberately whether to request and validate attestation during WebAuthn/FIDO2 registration based on your assurance requirements, recognizing that attestation policy and verification vary by relying party configuration.
Bind registered public key credentials to the correct relying party identifier and store credential metadata securely, remembering that a signed authentication assertion is not the same as an encrypted one.
Integrate passwordless registration events with identity governance processes so that newly enrolled authenticators are captured for access reviews, deprovisioning, and audit, keeping lifecycle records distinct from runtime authentication enforcement.
Use step-up or additional verification when enrolling a new authenticator for an existing account, since registering a credential is a sensitive operation that, depending on configuration, could otherwise be abused to add attacker-controlled authenticators.
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