Their website mention issuance charges for add on but not AMC.
You can have 3 active cards at a time. It might be all 3 primary also, I've 2 primary right now.
You'll be charged 590 issuance and 885 next year onwards for any card be it primary or add on
PS: They issued second primary as duplicate in their system. (I was watching from behind in his screen 😂😂)