Android not receiving ACS Push Notifications

I am trying to set up some push notifications for my app. I have iOS working, but Android is not receiving any notifications.

This is the code I'm using to subscribe to ACS.

var CloudPush = require('ti.cloudpush');
Cloud.Users.login({
    login: 'push',
    password: 'push'
}, function (e) {
    if (e.success) {
        //alert("login success");
 
        CloudPush.retrieveDeviceToken({
            success: function(e) {
                //alert('Device Token: ' + e.deviceToken);
 
                Cloud.PushNotifications.subscribe({
                    channel: 'updates',
                    device_token: e.deviceToken,
                    type: 'gcm'
                }, function (e) {
                    if (e.success) {
                        alert('Subscribed for Push Notification!');
                    } else {
                        //alert('Subscribe Error:' + ((e.error && e.message) || JSON.stringify(e)));
                    }
                });
            },
            error: function(e) {
                //alert('Failed to register for push! ' + e.error);
            }
        });
    } else {
        //alert("Login Error :"+e.message);
    }
});

It says '1 Android client subscribed to push notifications' in the ACS Push Notifications panel, and when I send a notification it say the notification has 'Sending Status' of 'Success'.

The app is not receiving any push notifications though.

Have I missed some steps to getting it working? I have set up the Android Push Configuration in Settings for the app. It should be working I think.