I don't know about AZCOM specifically, but "provisional" acceptances generally result from the fact that a given school has accepted you for their entering class, but your acceptance is pending the completion, or proof of completion, of some sort of requirement, usually a premedical prerequisite. It's really best to call the admissions staff and ask them directly what this means and how you might meet their requirements, if it's true that your acceptance is pending your fulfillment of some requirement.
Good Luck.