Regarding userVerification I have now figured out how to set the userVerificationPreference field. Specifically, I used the init(rawValue:) method of ASAuthorizationPublicKeyCredentialUserVerificationPreference to set the value retrieved from the WebAuthn options userVerification. registrationRequest.userVerificationPreference = ASAuthorizationPublicKeyCredentialUserVerificationPreference.init( rawValue: userVerification.rawValue )