I have an article for you that can help you troubleshoot this issue:
Push notifications require an active Wi-Fi or cellular connection.
Note: Notifications use Wi-Fi only when a cellular connection is unavailable. Firewalls and proxy servers may affect your ability to receive notifications. For more information, see Unable to use Apple Push Notification service (APNs).
If you're not receiving notifications for a specific app, try these steps:
- Verify that the app supports notifications.
- After installing an app or restoring a backup to a different iOS device, open the app to begin receiving notifications. If the app requires entering or logging in to an account, you will need to do this before receiving notifications.
- Check Settings > Notification Center to ensure that the app is configured for notifications. If notifications do not appear in the Notification Center, verify that the Notification Center setting for the app is enabled
If these troubleshooting steps do not resolve your issue, you may need to restore your iPhone according to the instructions in this article:
Thanks for using the Apple Support Communities!