Getting response "System.Net.HttpStatusCode.Unauthorized"

public static async TaskgetDataFromService(string wInputData, string Uri)

{

string json = string.Empty;

using (HttpClient client = new HttpClient())

{

//client.DefaultRequestHeaders.Add("API_KEY", "X-some-key");

client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Authorization","Basic MzUzYjMwMmM0NDU3NGY1NjUwNDU2ODdlNTM0ZTdkNmE6Mjg2OTI0Njk3ZTYxNWE2NzJhNjQ2YTQ5MzU0NTY0NmM=");

client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

HttpContent content = new StringContent(wInputData);

content.Headers.ContentType = new MediaTypeHeaderValue("application/x-www-form-urlencoded");

var response =await client.PostAsync("http://13.228.72.152:8080/JioMeet/oauth/token",content);

if (response != null)

{

return response.ToString();

//return response.StatusCode;

}

else

{

return "no data";

// return System.Net.HttpStatusCode.BadRequest;

}

}

}