I have just started using Kinvey and have not been unable to create a user with an email or update the user with the email.

Register code (creates user with no email)

AsyncUser myUser = myClient.User();
myUser.Add("email", "test@test.com");

myUser.Create(UsernameText.Text, PasswordText.Text, new KinveyDelegate<User> {
    onSuccess = (user) => {
       Console.WriteLine("user registration success");
    }, 
    onError = (error) => {
       Console.WriteLine("base Exception -> " + error.GetBaseException());
       Console.WriteLine("Registration failure");
   }
});

Update code (fails with error) - Code from Xamarin documentation

myClient.User().Add("email", "test2@test.com");

User updated = await myClient.User().UpdateAsync();

Error:

Self referencing loop detected for property 'Member' with type 'System.Reflection.MonoMethod'. Path 'KinveyClient.logger.Method.ReturnTypeCustomAttributes'.