HttpClient.SendRequest exception

I use Xamarin.Forms and I run my application on the Android-simulator and on my mobile device

When I try to send HttpRequestMessage, my application is turned off. This happens in the SendRequest method, but sometimes I get An error occurred while sending the request

• I use localhost endpoint: http://localhost:62690
• Uri : http://localhost:62690/api/account/login

I also created a console application, tested the request there and everything works, but Android does not.

public async Task<TResult> PostAsync<TResult>(string uri, IRequestData data, string token = "", string header = "")
        {
            var request = new HttpRequestMessage(HttpMethod.Post, uri);
            request.AddAuthoriationHeader(token);

            var content = data.ToJson();
            request.SetContent(content, ContentTypes.Json);

            var response =  await SendRequestAsync(request);
            var result = await HandleResponseAsync<TResult>(response);

            return result;
        }

public static void SetContent(this HttpRequestMessage request,
            string content,
            ContentTypes contentType)
        {
            request.Content = new StringContent(content,
                Encoding.UTF8,
                contentType.Value());
        }

public static string Value(this ContentTypes contentType)
        {
            switch (contentType)
            {
                case ContentTypes.XxxForm:
                    return "application/x-www-form-urlencoded";
                case ContentTypes.Json:
                    return "application/json";
                default:
                    throw new ArgumentOutOfRangeException(nameof(contentType), contentType, null);
            }
        }

private async Task<HttpResponseMessage> SendRequestAsync(HttpRequestMessage request)
            {
                try
                {
                    using (var client = new HttpClient())
                    {
                        return await client.SendAsync(request); // Shut down on this line
                    }
                }
                catch (ArgumentNullException e)
                {
                    Console.WriteLine(e.Message);
                    throw;
                }
                catch (InvalidOperationException e)
                {
                    Console.WriteLine(e.Message);
                    throw;
                }
                catch (HttpRequestException e)
                {
                    Console.WriteLine(e.Message);
                    throw;
                }
                catch (Exception e)
                {
                    Console.WriteLine(e.Message);
                    throw;
                }
            }

What is it can be and why the conversion in the console to the local host is working, but with the phone and emulator error?