If your push notification are not working, first thing to check is whether you uploaded an APNS Certificate or not. You can check this by going to the Developer Portal then “Push Notifications”. If you don’t see any certifications under ‘Existing Notification Certificates’, upload your .p12 file here and make sure to test it out whether or not it works.
You can get your .p12 file by following the steps on this document: https://cdn.skillz.com/doc/developer/ios_native/push_notifications_optional/upload_your_p12_apns_certificate/
If you have other questions regarding this topic, feel free to reach out to us at firstname.lastname@example.org.