I'm facing the same issue in iOS 15.1 Push Kit notification not arriving when app is killed or in background. But it's working in iOS 14 which is strange. Did anyone facing this issue in iOS 15.1?
LokeshMyXplora
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution