云小秘sdk调用

代码如下:调用会提示 SDK.InvalidRegionId : Can not find endpoint to access.”,其中我将keyid和keysecret 替换为正确值,regionid则为空,不知道正确调用方法是什么.

        ChatRequest chatRequest = new ChatRequest();
        chatRequest.AccessKeyId = "LTAIyxEzjIpOW2BC";
        chatRequest.Action = "Chat";
        chatRequest.InstanceId = "chatbot-cn-mp90f3ss700090";
        chatRequest.Utterance = textBox1.Text;

        IClientProfile clientProfile = DefaultProfile.GetProfile("<your-region-id>", "<your-access-key-id>", "<your-access-key-secret>");

        DefaultAcsClient client = new DefaultAcsClient(clientProfile);
        
        
        ChatResponse chatResponse = client.GetAcsResponse(chatRequest);