Hello!
So yes its quite normal to wait for months. I got my ID and password after almost 2 months or so. Hence it's possible that you won't receive it before May end.
As for dual degrees, one hears back real late in June or July I suppose, in any case, why don't you confirm with the admin dept of ScPo. They have been a great help to me with my queries and all.
Last but not the least, congratulations on your acceptance