WebAuthn security keys

Currently, only security keys that can be configured as passkeys are supported.

Passkeys are a modern replacement for traditional passwords, based on WebAuthn and FIDO2 standards. They enable passwordless authentication by verifying both possession of a device and an additional user verification step (such as biometrics, PIN entry, or a user gesture).

For a security key to be supported, it must be able to correctly set the User Verification (UV) flag during the WebAuthn authentication flow. The UV flag indicates that the key has confirmed that the user is physically present and actively authenticating.

Some older or limited-functionality security keys do not support the necessary mechanisms (such as built-in biometrics or PIN prompts) to perform user verification. As a result, they cannot set the UV flag and are not supported for passkey use.

Attempting to register an unsupported security key will result in an error during registration process.

Examples of Unsupported Security Keys

• YubiKey 4 Series (e.g., YubiKey 4 Nano, YubiKey 4C)

• YubiKey NEO

• Older FIDO U2F-only keys without FIDO2/WebAuthn support

Requirements for Supported Keys

• Must support passkey registration and authentication (WebAuthn + FIDO2).

• Must be capable of user verification (e.g., PIN entry, biometrics, or touch gestures).