MYM Buff ? Problem ...

How do I know i have the buff ? I picked up the scroll from crown store. And says use ? When I press it gives me a logged top right hand corner says " You've already completed this task."

But is doesn't state anywhere if I have the buff ?

Says use to add to your library.
Then I get the same thing "You've already completed this task."

Everyone else says there getting more AP than me ?
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