Does BBM (Blackberry Messenger) works on iphone 5S with ios 7?

I have installed BBM on my iPhone 5S already, and also invite friends by PIN, SMS and emails as well, but I am never able to accept the authorisation after my friends have accepted it. Also my friends' blackberries are showing the 'Pending Authorisation' on the BBM instead.

I wonder do I need to update any softwares or setting before I can approve them from my BBM on iPhone?

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