Push Notifications on IOS 7/8:deviceTokenSuccess(e) not being called

It seems that the function deviceTokenSuccess(e) is not being called after registerForPushNotifications. I followed the example but I can't get it to work.

Herewith my code:

// Alloy.Globals.someGlobalFunction = function(){};
var deviceToken = null;
 
// Check if the device is running iOS 8 or later
if (Ti.Platform.name == "iPhone OS" && parseInt(Ti.Platform.version.split(".")[0]) >= 8) {
    function registerForPush() {
        Ti.Network.registerForPushNotifications({
            success: deviceTokenSuccess,
            error: deviceTokenError,
            callback: receivePush
        });
        // Remove event listener once registered for push notifications
        Ti.App.iOS.removeEventListener('usernotificationsettings', registerForPush); 
    };
 
    // Wait for user settings to be registered before registering for push notifications
    Ti.App.iOS.addEventListener('usernotificationsettings', registerForPush);
 
    // Register notification types to use
    Ti.App.iOS.registerUserNotificationSettings({
        types: [
            Ti.App.iOS.USER_NOTIFICATION_TYPE_ALERT,
            Ti.App.iOS.USER_NOTIFICATION_TYPE_SOUND,
            Ti.App.iOS.USER_NOTIFICATION_TYPE_BADGE
        ]
    });
 
} else {
    // For iOS 7 and earlier
    Ti.Network.registerForPushNotifications({
        // Specifies which notifications to receive
        types: [
            Ti.Network.NOTIFICATION_TYPE_BADGE,
            Ti.Network.NOTIFICATION_TYPE_ALERT,
            Ti.Network.NOTIFICATION_TYPE_SOUND
        ],
        success: deviceTokenSuccess,
        error: deviceTokenError,
        callback: receivePush
    });
}
 
// Process incoming push notifications
function receivePush(e) {
    alert('Received push: ' + JSON.stringify(e));
}
// Save the device token for subsequent API calls
function deviceTokenSuccess(e) {
    deviceToken = e.deviceToken;
}
 
function deviceTokenError(e) {
    alert('Failed to register for push notifications! ' + e.error);
}