Viber-API. I get the error message "Bad receiver ID".

Question

1. Created an application.
   I try to get information on the "bot".
   I get the following information:

2. I try to send a message to user "members.1".

 

I use:
- language - C#;

- WinForm;

- recommendations - https://developers.viber.com/docs/api/rest-bot-api/#send-message;
- for "Receiver": "01234567890A =" I use "id" from item.1 -> picture 4 -> id

I use the code.

   class ViberMessage
{
    public string Receiver { get; set; }
    ///
    /// Minimum API version required by clients for this message (default 1)
    ///
    public int Min_api_version { get; set; } = 1;
    public ViberSender Sender { get; set; }
    public string Tracking_data { get; set; }
    public string Type { get; set; } = "text";
    public string Text { get; set; }

}

public class ViberSender
{
    public string Name { get; set; }
    public string Avatar { get; set; }
}



///
///  Send a message. Member Account.
///
///
///
private void bt_SendMessMemb_Click(object sender, EventArgs e)
{
    string json = FillMember_2();

    Encoding utf = Encoding.UTF8;

    byte[] jsonUTF = utf.GetBytes(json);
    string jsonUTFstr = utf.GetString(jsonUTF);

    MessageWork messageWork = new MessageWork();
    messageWork.ViberCall(jsonUTFstr);
}


public string FillMember_2()
{
    string json = "";
            var msg = new ViberMessage
        {
            Receiver = "?u7L???+wyD/?????????==", // text conditionally hidden
            Min_api_version = 1,
            Sender = new ViberSender
            {
                        Name = "?????",
                        Avatar = ""
            },
            Tracking_data = "tracking data",
            Type = "text",
            Text = "Test message - 1"
        };

        json = JsonConvert.SerializeObject(msg);
    return json;
}



class MessageWork
{
    public void ViberCall(string json)
    {
        var request = (HttpWebRequest)WebRequest.Create("https://chatapi.viber.com/pa/send_message");
        request.ContentType = "application/json";
        request.Method = "POST";
        request.Headers.Add("X-Viber-Auth-Token", "49c9a7b9a9e7d096-XXXXXXXXXXXX-XXXXXXXXX"); // text conditionally hidden

        using (var streamWriter = new StreamWriter(request.GetRequestStream()))
        {
            streamWriter.Write(jsonN);
            streamWriter.Flush();
        }

        string resultStr;

        var response = (HttpWebResponse)request.GetResponse();
        using (var streamReader = new StreamReader(response.GetResponseStream()))
        {
            var result = streamReader.ReadToEnd();

            resultStr = result.ToString();
        }

        jsonN = jsonN + "/r/n "  + resultStr;
    }
}

In the line "jsonN = jsonN +" \ r \ n "+ resultStr; " I get

{"Receiver":"?u7L???+wyD/?????????==", // text conditionally hidden
"Min_api_version":1,
"Sender":{"Name":"?????","Avatar":""},
"Tracking_data":"tracking data","Type":"text",
"Text":"???????? ????????? - 1"}

 {"status":999,
 "status_message":"Bad receiver ID",
 "message_token":5324763260407665007,
 "chat_hostname":"SN-CHAT-05_"}

Question.
1. Why do I get the error "status_message": "Bad receiver ID"?
2. How to extinguish this error?