# passkey_registration_failed (/api/errors/passkey_registration_failed) ## When this happens [#when-this-happens] The attestation your authenticator returned during sign-up could not be verified. This can follow a mismatched relying-party domain (registering from a different origin than the one the server expects), an authenticator that returns an attestation format the server does not accept, a credential the device declined to create with the required user verification, or a browser extension interfering with WebAuthn. ## How to fix it [#how-to-fix-it] Start the sign-up again from the official domain and complete the device prompt (PIN or biometric) when asked. If it keeps failing, try a different authenticator or device, or sign in with Google/GitHub and add a passkey from settings afterward. The response message includes a specific reason after the colon, and the server records the underlying cause for support to inspect.