B4X FEED Ask user for notification permission at the first opening

[practicalsoft]

Hi, I've been looking all around about how to set permission in order to ask the user ( only at the first time the app is opened) to allow my app to send him notification.. I've tried with
B4X:

AddPermission(android.permission.POST_NOTIFICATIONS)

but at the startup, the app doesn't ask any permission...

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