public void ConfigureServices(IServiceCollection services) {
    services.Configure<CookiePolicyOptions>(options => { // This lambda determines whether user consent for non-essential cookies is needed for a given request.
        options.CheckConsentNeeded = context => true;
        options.MinimumSameSitePolicy = SameSiteMode.None;
    });

    services.AddAuthentication(AzureADB2CDefaults.AuthenticationScheme) .AddAzureADB2C(options => Configuration.Bind("AzureAdB2C", options));
    services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
}