Scheduled notification not cleared

I schedule notification with : NotificationServices.ScheduleLocalNotification but once the notification got showed to the user, it does not disappear from the top notification on the iDevice.

When the application is launched I try to do : NotificationServices.ClearLocalNotifications() but to no avail…

What am I doing wrong?

No one got any idea?

I have the same problem with Unity 2018.2 running on iOS 11