Updated sample B2C client application configuration

App.xaml.cs

public partial class App : Application
    {
        private static string Tenant = "YOUR_TENANT.onmicrosoft.com";
        private static string ClientId = "YOUR_API_APPLICATION_ID";
        public static string PolicySignUpSignIn = "B2C_1_YOUR_POLICY_susi";
        public static string PolicyEditProfile = "B2C_1_YOUR_POLICY_profile";
        public static string PolicyResetPassword = "B2C_1_YOUR_POLICY_pwdedit";

        public static string[] ApiScopes = { "" };
        public static string ApiEndpoint = "https://localhost/demo-api/";

        private static string BaseAuthority = "https://login.microsoftonline.com/tfp/{tenant}/{policy}/oauth2/v2.0/authorize";
        public static string Authority = BaseAuthority.Replace("{tenant}", Tenant).Replace("{policy}", PolicySignUpSignIn);
        public static string AuthorityEditProfile = BaseAuthority.Replace("{tenant}", Tenant).Replace("{policy}", PolicyEditProfile);
        public static string AuthorityResetPassword = BaseAuthority.Replace("{tenant}", Tenant).Replace("{policy}", PolicyResetPassword);

        private static PublicClientApplication _clientApp = new PublicClientApplication(ClientId, Authority, TokenCacheHelper.GetUserCache());
        
        public static PublicClientApplication PublicClientApp { get { return _clientApp; } }
    }