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{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "mobileanalytics:PutEvents",
                "cognito-sync:*",
                "cognito-identity:*"
            ],
            "Resource": [
                "*"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "sns:CreatePlatformEndpoint",
                "sns:Subscribe",
                "sns:SetEndpointAttributes"
            ],
            "Resource": [
                "arn:aws:sns:us-west-9:999999999999:*"    
                
            ]
            
        }
    ]
}

３．iOSプロジェクトの設定

<plist version="1.0">
<dict>
  <key>aps-environment</key>
  <string>production</string>   <!--RELEASE MODE-->
  <!--<string>development</string>  DEBUG MODE-->
</dict>
</plist>

using Amazon;
using Amazon.Util;
using Amazon.CognitoIdentity;
using Amazon.SimpleNotificationService;
public partial class AppDelegate : global::Xamarin.Forms.Platform.iOS.FormsApplicationDelegate
{
    public override bool FinishedLaunching(UIApplication app, NSDictionary options)
    {
        global::Xamarin.Forms.Forms.Init();

        //通知の許可を求める
        DependencyService.Get<INotificationService>().Regist();

        //AWS
        this.SetAmazonSnsSettings();

        LoadApplication(new App());
        return base.FinishedLaunching(app, options);
    }

    #region "AWS"

    private AmazonSimpleNotificationServiceClient _snsClient = null;

    /// <summary>
    /// AWS認証
    /// </summary>
    private void SetAmazonSnsSettings()
    {
        //AWSログの設定
        var loggingConfig = AWSConfigs.LoggingConfig;
        loggingConfig.LogMetrics = true;
        loggingConfig.LogResponses = ResponseLoggingOption.Always;
        loggingConfig.LogMetricsFormat = LogMetricsFormatOption.JSON;
        loggingConfig.LogTo = LoggingOptions.SystemDiagnostics;

        //AWSの認証
        AWSConfigs.AWSRegion = "us-west-9";
        AWSConfigs.CorrectForClockSkew = true;
        var offset = AWSConfigs.ClockOffset;

        CognitoAWSCredentials credentials = new CognitoAWSCredentials(
            "us-west-9:XXXXXXX-9999-9999-XXXX-XXXXXXXXXX", //Cognito identity pool ID
            RegionEndpoint.USWest9 // Region
        );

        _snsClient = new AmazonSimpleNotificationServiceClient(credentials, RegionEndpoint.USWest2);
    }

    public override void DidRegisterUserNotificationSettings(UIApplication application, UIUserNotificationSettings notificationSettings)
    {
        // without this RegisteredForRemoteNotifications doesn't fire on iOS 8!
        application.RegisterForRemoteNotifications();
    }

    /// <summary>
    /// AWSへのEndPoint登録処理
    /// </summary>
    /// <param name="application"></param>
    /// <param name="deviceToken"></param>
    public override async void RegisteredForRemoteNotifications(
            UIApplication application, NSData deviceToken)
    {
        // Get current device token
        var DeviceToken = deviceToken.Description;
        if (!String.IsNullOrWhiteSpace(DeviceToken))
        {
            DeviceToken = DeviceToken.Trim('<').Trim('>').Replace(" ", "");

            //register with SNS to create an endpoint ARN
            var response = await _snsClient.CreatePlatformEndpointAsync(
            new CreatePlatformEndpointRequest
            {
                Token = DeviceToken,
                PlatformApplicationArn = "arn:aws:sns:us-west-9:9999999999:app/APNS_SANDBOX/AppName" /* insert your platform application ARN here */
            });
        }

        // Get previous device token
        var oldDeviceToken = NSUserDefaults.StandardUserDefaults.StringForKey("PushDeviceToken");

        // Has the token changed?
        if (String.IsNullOrEmpty(oldDeviceToken) || !oldDeviceToken.Equals(DeviceToken))
        {
            //TODO: Put your own logic here to notify your server that the device token has changed/been created!

        }

        // Save new device token
        NSUserDefaults.StandardUserDefaults.SetString(DeviceToken, "PushDeviceToken");
    }

    /// <summary>
    /// プッシュ通知の受信処理
    /// </summary>
    /// <param name="application"></param>
    /// <param name="userInfo"></param>
    public override void ReceivedRemoteNotification(UIApplication application, NSDictionary userInfo)
    {
        //baseは実行しない（エラーとなるため）
        //base.ReceivedRemoteNotification(application, userInfo);

        if (application.ApplicationState == UIApplicationState.Active)
        {
            //アプリがアクティブの場合
        }
        else if (application.ApplicationState == UIApplicationState.Inactive)
        {
            //アプリがアクティブでない場合
        }

        //ローカル通知で表示する場合（無くてもプッシュ通知表示されます）
        NotificationService ns = new NotificationService();
        ns.On("RemoteNotifications title",
                "RemoteNotifications subtitle",
                "RemoteNotifications body",
                null);
    }

    /// <summary>
    /// プッシュ通知の登録失敗
    /// </summary>
    public override void FailedToRegisterForRemoteNotifications(UIApplication application, NSError error)
    {
        new UIAlertView("Error registering push notifications", error.LocalizedDescription, null, "OK", null).Show();
    }

    #endregion
}

public void Regist()
{
    //ローカル通知の許可を求める
    ・
    ・省略
    ・

    UIApplication.SharedApplication.InvokeOnMainThread(() => {
        //プッシュ通知
        UIApplication.SharedApplication.RegisterForRemoteNotifications();
    });
}