iOS Notification Settings doesn't show up on the Notifications Settings in the phone

I’m using the Notification Plugin for Local Notifications but the notification settings doesn’t show up on some users with iOS phones.

Any idea on what could be happening?

This doesn’t appear to be related to a type of phone or a version of the OS. We have users that the notification settings for the app show up on the phone and other users in which this settings don’t show up.

Any ideas?