send json with https using post on android can't get response.

I tried to send json to server use WWW function using sertificate and https, when I run on desktop seems running normal, but when I build for android, there's nothing happen. It's no error or no result. Here's script

 IEnumerator SendingScore()
     {
         string data = "{\"campaignId\":\"" + 46 + "\",\"score\":\"" + 5000 + "\",\"mobileNo\":\"" + 0233256565 + "\"}";
         Debug.Log(data);
 
         Hashtable headers = new Hashtable();
         headers.Add("Content-Type", "application/json");
         headers.Add("Secret-key", "secretkey");
 
         byte[] pData = System.Text.Encoding.UTF8.GetBytes(data);
 
         WWW webRequest = new WWW("https://blahblahblah/blah", pData, headers);
         yield return webRequest;
 
         if (webRequest.error == null)
         {
             txtReward.text = webRequest.text;
             Debug.Log(webRequest.text);
         }
         else
         {
             txtReward.text = webRequest.text;
             Debug.LogError(webRequest.text);
         }
     }

sorry i replace the link with blahblah for my company privacy. Thank you..