Cannot get email to auto fill using cas3

[ekuitsystems]

I am not able to get the email field to automatically fill when creating a 
user using the cas3 provider, it does bring in my username.  Does anyone 
have this working?  Would you mind sharing the code?  Here's what I have:

  gitlab_rails['omniauth_providers'] = [
    {
        "name" => "cas3",
        "label" => "cas",
        "args" => {
            "url" => "https://casserver.mydomain.domain/";,
            "login_url" => "cas/login",
            "service_validate_url" => "cas/serviceValidate",
            "logout_url" => "cas/logout",
            "email_key" => "mail",
            "extern_uid" => "cn"
        }
    }


Thanks,

Byron

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