fmt value is "none" on ASAuthorizationPlatformPublicKeyCredentialRegistration

Like on the web, this is the default value unless you explicitly request attestation. You can do that through ASAuthorizationPublicKeyCredentialRegistrationRequest.attestationPreference.

Note that not all attestation preferences are supported by all security keys or passkeys.

Thanks for the feedback. Unfortunately the result still persists when setting the value as direct. Using the Platform authenticator with FaceID. Could I be missing a separate configuration here? 

Device Model: iPhone 12 mini      

let platformProvider = ASAuthorizationPlatformPublicKeyCredentialProvider(relyingPartyIdentifier: rpName) 
let platformKeyRequest = platformProvider.createCredentialRegistrationRequest(challenge: challenge, name: userName, userID: userIdData)
platformKeyRequest.userVerificationPreference = .required    
platformKeyRequest.attestationPreference = .direct    
let authController = ASAuthorizationController(authorizationRequests: [platformKeyRequest])    
authController.delegate = self    
authController.presentationContextProvider = self    
authController.performRequests()