Authorization_Code SignOutAsyn（）不会触发结束会话

Question

我有一个由Identity Server保护的门户，具有Authorization_code授予类型

HttpContext.SignInAsync(ClaimsPrincipal) 

工作正常，并将具有声明的用户重定向到门户，但是

await HttpContext.SignOutAsync(CookieAuthenticationDefaults.AuthenticationScheme);

在无法触发endsession端点将用户重定向到身份服务器下的注销操作的地方，该方法不起作用

public async Task Logout()
{            
            await HttpContext.SignOutAsync
                    (CookieAuthenticationDefaults.AuthenticationScheme);

}

startup.cs
ConfigureService(IServiceCollection services)
services.AddAuthentication()
            .AddCookie(cookieOptions =>
            {
                var tempProvider = services.BuildServiceProvider();
                cookieOptions.Cookie.Name = "PortalAuth";
                cookieOptions.Cookie.HttpOnly = true;

                cookieOptions.SessionStore = 
                 tempProvider.GetRequiredService<ITicketStore>();
                configureCookieOptions?.Invoke(cookieOptions);
            })
            .AddIdentityServerAuthentication(                    
               IdentityServerAuthenticationDefaults.AuthenticationScheme,
                idServOptions =>
                {
                    idServOptions.Authority = 
                       options.AuthorizationServiceUrl;
                    idServOptions.RequireHttpsMetadata = false;
                    idServOptions.ApiName = options.ApplicationName;
                    idServOptions.ApiSecret = options.ApplicationSecret;
                    idServOptions.EnableCaching = true;
                    idServOptions.CacheDuration = 
                           TimeSpan.FromMinutes(1);
                    idServOptions.SupportedTokens = 
                                SupportedTokens.Reference;
                   configureIdentityServerOptions?.Invoke(idServOptions);
                    idServOptions.Validate();
                });

var client = new Client{
...
 RedirectUris = { "http://localhost:12345" },
 PostLogoutRedirectUris = { "http://localhost:12345" },
}

在设置中我还缺少什么来触发endsession端点。 如果我需要手动调用结束会话，那么如何获取id_token_hint，并且我正在使用authorization_code授予类型

var disco = await 
            DiscoveryClient.GetAsync(Constants.AuthorizationServiceUrl);
            var endSessionUrl = new 
             RequestUrl(disco.EndSessionEndpoint)
            .CreateEndSessionUrl(IdTokenHint:?,State:?);
            return Redirect(endSessionUrl);