I couldn't able to get the 'faceId' in face detect APIs response

@NewGene Technologies Welcome to Microsoft Q&A Forum, Thank you for posting your query here!

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To perform the FaceDetect Operation from console application, you can leverage the below sample code:

Note: Please update the {Region} of your face resource and the subscription key in below code:

            string _url = "https://{REGION}.cognitiveservices.azure.com/face/v1.0/detect?returnFaceId=true&returnFaceLandmarks=false&returnFaceAttributes=headpose,mask,qualityforrecognition&recognitionModel=recognition_04&returnRecognitionModel=false&detectionModel=detection_03&faceIdTimeToLive=86400";
            string _key = "XXXXXXXXXXXX"; // Replace with your subscription key

            HttpWebRequest wr = (HttpWebRequest)WebRequest.Create(_url);
            wr.ContentType = "application/json";
            wr.Method = "POST";
            wr.Headers.Add("Ocp-Apim-Subscription-Key", _key);

            // Define the request body as a JSON string
            string jsonRequestBody = @"{
    ""url"": ""https://www.gravatar.com/avatar/205e460b479e2e5b48aec07710c08d50.jpg""
}";

            // Convert the JSON request body to a byte array
            byte[] postData = System.Text.Encoding.UTF8.GetBytes(jsonRequestBody);

            Stream rs = wr.GetRequestStream();
            rs.Write(postData, 0, postData.Length);
            rs.Close();

            HttpWebResponse wresp = (HttpWebResponse)wr.GetResponse();

            // Read and display the response content
            using (StreamReader streamReader = new StreamReader(wresp.GetResponseStream()))
            {
                string responseStr = streamReader.ReadToEnd();
                Console.WriteLine("Response:");
                Console.WriteLine(responseStr);
            }

            wresp.Close();

            Console.ReadLine();

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Hope this helps. If you have any follow-up questions, please let me know. I would be happy to help.

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