SendGrid无法通过Xamarin发送电子邮件

Question

我正在尝试从SendGrid发送基本的测试电子邮件。我的应用程序已连接到azure服务器，并且上面有SendGrid资源。我在SENDGRID_APIKEY下的应用程序设置中有我的api密钥，并且我知道我的应用程序已正确连接到azure服务器，因为基本的todolist示例可以正常工作。但是，即使运行它时没有出现任何编译器错误，我似乎也无法通过它发送电子邮件。我决定在应用程序启动时对其进行测试，因此它与应用程序的问题无关。

我发送电子邮件的代码

using System;
using Microsoft.WindowsAzure.MobileServices;
using Xamarin.Forms;
using static TestApp.Views.Styles.ToDoItem;
using System.Net.Http;
using System.Net.Mail;
using SendGrid;
using SendGrid.Helpers.Mail;

namespace TestApp
{
    public partial class App : Application
    {


        public static MobileServiceClient MobileService =
    new MobileServiceClient(
    "https://kidneyapp.azurewebsites.net"
);

        public App()
        {
            InitializeComponent();



            CurrentPlatform.Init();
            TodoItem item = new TodoItem { Text = "Awesome item" };
             MobileService.GetTable<TodoItem>().InsertAsync(item);

            var apiKey = System.Environment.GetEnvironmentVariable("SENDGRID_APIKEY");
            var client = new SendGridClient(apiKey);
            var msg = new SendGridMessage()
            {
                From = new EmailAddress("test@example.com", "DX Team"),
                Subject = "Hello World from the SendGrid CSharp SDK!",
                PlainTextContent = "Hello, Email!",
                HtmlContent = "<strong>Hello, Email!</strong>"
            };
            msg.AddTo(new EmailAddress("test@example.com", "Test User"));
            var response = await client.SendEmailAsync(msg);
        }
    }
}