ONLINE NOTIFICATIONS FOR IOS
1. Check that you are updated to latest version of the app.
2. Check that you are logged into Game Center. Game Center is located under Settings on your device.
3. Check that your have Game Center notifications enabled. Go to Settings > Notifications > Games
4. Log out, then back into Game Center and restart your device.
5. If you still aren’t receiving notifications, try a different Wifi or Cellular network, or reset your Wifi.
If you are trying to find a friend, you must invite them using the Apple ID associated with their Game Center account, and you both must be logged into Game Center.