Error on initial push notification subscription

1. What is a push notification example?
2. What is a push pin notification?

What is a push notification example?

In this example, YouTube app notifies app users about new uploads from channels they are subscribed to. The push action buttons allow users to control when they want to watch these videos by adding options such as 'Watch Later' and 'Others'.

What is a push pin notification?

What Is a Push Pin Notification? Pinned notifications are slightly different from the alerts as they can be placed on the main screen/desktop and pinned there as long as the user wishes to see them.