Last week, I upgraded from iOS 12 to iOS 13 on my iPhone XS - all was fine. Due to upgrading to an 11 Pro, I then made an iCloud Backup on my XS, and then restored to the just-created backup on my new 11 Pro - again, all fine.
Since that time, however, I've noticed that I'm not receiving push notifications for the majority of apps that I have installed on my new 11 Pro - the only apps that appear to be sending me notifications are the ones that I've deliberately opened manually from my home screen - apps that I haven't yet opened since restoring from my iCloud Backup arn't producing anything - it's worth noting that they were working as expected after upgrading from iOS 12 to 13 on my XS before erasing it. So - things that I've tried so far:
Rebooting the phone
Checking the "Notifications" screen from within Settings.app - all notification settings are as they should be, and are enabled for apps that arn't currently producing them
Things that I deliberately haven't done yet:
Removed the apps that arn't currently producing notifications; I have a lot of these, and don't want to spend time re-organising my Home screen folders if I can avoid it!
Opening each app at least once to see if this begins to generate notifications (see my reasoning below for this)
So - my question. Upon restoring from an iCloud Backup, is it necessary to first open each app individually to force notifications to come through as they were doing before I restored? I have a lot of apps, but would prefer doing this than reinstalling them all individually. I don't remember having to do this when upgrading from my old iPhone 7 to the XS last year; I don't completely understand how APNS works, so can't figure out if my tokens will still be valid from my old iPhone or whether there's a simple solution to this that I just haven't tried yet. I'm not sure if the opening each app approach will work; I opened the Stack Exchange app upon restoring from iCloud to enter my login info, but as of yet haven't received any notifications - I know for a fact that I would have; I have new items in my Inbox that haven't come through as a notification on my new 11 Pro.