Netcore SAML auto challenge example

Questions SAML
1

Hi All

How implement SAML auto challenge feature accross cookie Authentication Schema?
If User is not authenticated SAML should redirect to okta.com login page.

public void ConfigureServices(IServiceCollection services) {

            services.ConfigureApplicationCookie(options =>
            {
                options.Cookie.Name = "MiddlewareIdentityProvider.Identity";
            });


            services.AddSaml(this.Configuration.GetSection("SAML"));

            // Add the SAML middleware services.
            services.AddSamlMiddleware(options =>
            {
                options.PartnerName = () => Configuration["PartnerName"];
            });
}

public void Configure(IApplicationBuilder app, IHostingEnvironment env) {
     app.UseAuthentication().UseSaml();
}

Thank you.