How do I stop my application from crashing when starting an android email intent.

I developed a dependency service for sending an email from xamarin.forms. This used to work just fine. But, after a few Xamarin.Forms updates and related Xamarin.Android... API updates, this stopped working. At one point, I had to change the way I get the context to call the StartActivity(email) method.

Now, the email activity starts and I am able to send the email, but the app that called it crashes. And, I cannot figure out why. Is there something that I am doing wrong?

Method in common project (NetStandard 1.6)

private async Task EmailFileAsync(EmailContent emailContent)
{
var emailer = DependencyService.Get();
Tuple<bool, string> response = new Tuple<bool, string>(false, "Unable to get an Email Manager from the device. ");

        if (emailer != null)
        {
            response = await emailer.SendEmailAsync(emailContent);
        }

        if (!response.Item1)
        {
            await DisplayAlert("Send TRN Failure", response.Item2, "OK");
        }

        return response.Item1;

}

Dependency Service in Android project

using Android.App;
using Android.Content;
using System;
using System.IO;
using System.Threading.Tasks;
using TPS_Mobile_NS.Droid.InterfacesImplemented;
using TPS_Mobile_NS.Interfaces;
using TPS_Mobile_NS.Models;
using Xamarin.Forms;

[assembly: Dependency(typeof(EmailManager))]
namespace TPS_Mobile_NS.Droid.InterfacesImplemented
{
public class EmailManager : Activity, IEmailManager
{
public Task<Tuple<bool, string>> SendEmailAsync(EmailContent emailContent)
{
var sendWasSuccessful = false;
var errorMessage = string.Empty;
try
{
var email = new Intent(Intent.ActionSend);

            // Finish email.
            email.PutExtra(Intent.ExtraSubject, emailContent.Subject);
            email.PutExtra(Intent.ExtraText, emailContent.Body);         
            email.SetType("message/rfc822");
            email.AddFlags(ActivityFlags.NewTask);

            Context context = Android.App.Application.Context;
            context.StartActivity(email);

            sendWasSuccessful = true;
            return Task.FromResult(new Tuple<bool, string>(sendWasSuccessful, errorMessage));
        }
        catch(Exception ex)
        {
            errorMessage = ex.Message;
            return Task.FromResult(new Tuple<bool, string>(sendWasSuccessful, errorMessage));
        }

    }