create_user api not saving the email address

Hi was trying to create a user using the create user api. I was able to save and retrieve back the created user but I was wondering the email is always null even though I sent it with value.  If anyone could also direct me to documentation where I could see the list of acceptable fields for the body for the create user I would appreciate.

This is my sample parameters(body) I sent:

var newUserProfile = new LookerUserProfile()
                    {
                       FirstName = "MyFirstname",
                       LastName = "MylastName",
                       Email = "MyFirstname.MylastName@gmail.com"
                    };

https://docs.looker.com/reference/api-and-integration/api-reference/v3.0/user#create_user

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