Unable to create Storage account on Azure ARM using Web API

I am trying to create a storage account using Web API but it is giving me the exception that method not allowed as shown below

below are the code which I am using

string stAccName = "TCStorageAccount"+Guid.NewGuid().ToString().Substring(0, 8); stAccName = stAccName.ToLower();

            using (var client = new HttpClient())
            {
                client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);

                using (var stream = new MemoryStream())
                using (var writer = new StreamWriter(stream))
                {
                    var payloadText = JsonConvert.SerializeObject(parameters);

                    writer.Write(payloadText);
                    writer.Flush();
                    stream.Flush();
                    stream.Position = 0;

                    using (var content = new StreamContent(stream))
                    {
                        content.Headers.Add("Content-Type", "application/json");
                        content.Headers.Add("x-ms-version", "2016-12-01");
                        Uri uri = new Uri(String.Format("http://ift.tt/2wIhXJo", "subid", "resource group name", stAccName));

                        var response = await client.PostAsync(uri, content);

                        if (!response.IsSuccessStatusCode)
                        {
                            throw new InvalidOperationException(response.ReasonPhrase);
                        }
                    }
                }
            }

I also tried with another way as discussed in this thread Unable to create Storage account on Azure C# but still unable to create a storage account.

Any help would be appreciated. Thanks