403 error in topic send

[download69]

hi
when i use simple send, i don't have any problem and it send successfully.
but when i use send with topic, it returned 403 code ...

my codes :
` var client = new HttpClient();
client.DefaultRequestHeaders.Add("Authorization", "Token ****");

        var response = await client.PostAsync(
            "https://api.pushe.co/v2/messaging/notifications/",
            getTopicNotificationData(Title, content, token)
        );

        var status_code = (int)response.StatusCode;`

`var data = new JObject();
data.Add("title", Title);
data.Add("content", content);
data.Add("action", "{"action_type":"G"}");

        var topics = new JObject();
        topics.Add("topics", new JArray(new String[] { token }));

        var request_data = new JObject();
        request_data.Add("app_ids", new JArray(new String[] { "****" }));
        request_data.Add("data", data);
        request_data.Add("topics", topics);

        //      Console.WriteLine("Request data: " + request_data.ToString());

        return new StringContent(request_data.ToString(), Encoding.UTF8, "application/json");`

is any solution to solve it ...