c# – Microsoft Bot Framework DirectLine无法访问对话

[HttpPost]
    [Route("remind")]
    public string Remind()
    {
        var secret = System.Configuration.ConfigurationManager.AppSettings["secret"];

        var uri = new Uri("https://directline.botframework.com/");
        var creds = new DirectLineClientCredentials(secret);

        DirectLineClient client = new DirectLineClient(uri,creds);
        Conversations convs = new Conversations(client);

        var conversationIDs = new string[] { "0000000000000000-0000000000000000","00:0123456789abcdefghijklmnopqrstuvwxyz0123456789-A-_0123456798ABCDEF" }; // Existing Facebook & Skype conversations

        // Send a message to each conversation:
        foreach (var conversationID in conversationIDs)
        {
            Message message = new Message(conversationId: conversationID,fromProperty: "My Bot",text: "Hey dude,remember that thing!");
            Console.WriteLine(message.Text);
            convs.PostMessage(conversationID,message); // FAILS - This executes but doesn't do anything.
        }

        // Try reading the messages from a conversation (just to test if it's working):
        string waterMark = null;
        var set = convs.GetMessages(conversationIDs[0],waterMark); // FAILS - This fails with a 404 not found.
        waterMark = set.Watermark;

        return "Done :-)";
    }

它无法以静默方式调用PostMessage(),并因GetMessages()而失败.我似乎正在做正确的事情,机器人是现场等在Facebook和& Skype与DirectLine API分开.它只有在我使用DirectLine API创建新会话时才有效,然后我可以访问其消息并向其发布新消息.

这个问题有点帮助,但并不能告诉我如何解决它：
Difficulty accessing messages in an existing conversation in Microsoft Bot Framework

任何帮助将非常感激.

谢谢