Use the hook useSignUpEmailSecurityKeyEmail to sign up a user with security key and an email using the WebAuthn API. 
const {
  signUpEmailSecurityKey,
  needsEmailVerification,
  isLoading,
  isSuccess,
  isError,
  error
} = useSignUpEmailSecurityKeyEmail()

console.log({ needsEmailVerification, isLoading, isSuccess, isError, error })

const handleFormSubmit = async (e) => {
  e.preventDefault()

  await signUpEmailSecurityKey('joe@example.com')
}

​
Parameters

options optional SignUpSecurityKeyOptions