Harmont docs
APIErrors

passkey_user_verification_required

The authenticator signed in without user verification.

HTTP status400
typeinvalid_request
codepasskey_user_verification_required
Default messageYour device must verify it's you (PIN, biometric) to use this passkey.

When this happens

Harmont requires user verification (a PIN, fingerprint, or face check) on every passkey sign-in. Your authenticator completed the ceremony without performing that step.

How to fix it

Use a passkey backed by a PIN or biometric, or enable a device unlock method on your security key, then sign in again.

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