A passkey rollout changes how a user proves control of an account. It also changes what happens when the user replaces a phone, loses a security key, or cannot access a synchronized credential. The normal sign-in flow and the recovery flow form one account lifecycle.
For a business, the deployment question is broader than whether a passkey button works. It includes who can register another authenticator and which evidence is accepted when the usual authenticator is unavailable.
Understand the protection being added
NIST describes phishing resistance as a property of an authentication protocol that prevents disclosure of usable authentication secrets to an impostor verifier without relying on the user's vigilance. Cryptographic binding to the intended service is central to that protection. NIST's authenticator requirements explain the distinction from manually entered codes.
That protection applies to authentication. It does not independently prevent malware on a signed-in device from acting through an existing session, nor does it determine how a help desk verifies a recovery request. These remain separate parts of the system to review.
Enrollment establishes future authority
Adding an authenticator gives another credential the ability to sign in. An illustrative customer portal might allow enrollment after a fresh authentication, then notify the user through an established channel. The exact requirements depend on the account's assurance needs and the identity system in use.
Test enrollment from a normal session, a stale session, and a recently recovered account. Inspect whether a user can list and remove authenticators, and whether security notifications identify the change without exposing credential material. Registration should be treated as an account-security event rather than a cosmetic profile update.
Exercise recovery before a real lockout
Use a test account to simulate the loss of its primary device. Follow every supported recovery path, including help-desk handling if offered. Record which identity evidence is requested, who can approve recovery, and whether the process removes or preserves existing authenticators and sessions.
A fallback can change the effective assurance of the account. For example, if an email link alone permits a new credential to be registered, control of that mailbox becomes relevant to account recovery. That may be a deliberate product decision, but it needs to be documented and evaluated alongside the normal passkey flow.
Measure coverage across the lifecycle
Enrollment counts show adoption, while recovery success, unauthorized enrollment attempts, and session revocation results describe other operational properties. Keep these measures separate. A high registration rate does not establish that dormant password or recovery paths have been reviewed.
An assessment can provide evidence for normal sign-in, credential addition, device loss, recovery, and account closure. That gives the business a release record covering both daily use and exceptions. It also identifies which fallback procedures require support training or additional verification before broader rollout.
Sources
NIST: Authenticator Event Management. The portal workflow is illustrative; applicable assurance requirements depend on the deployment.
