When to get a rental license in Philly?

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I'm closing on my first duplex in Philly at the end of April, and am wondering when I should apply for the rental license. The property is zoned RSA-3 single family with a variance for use as a duplex. The seller never bothered to get a CAL (Commercial Activity License) or rental license, but has applied for one to verify the property is correctly zoned. 

I recently applied and was approved for a CAL for this property, but no results populated for the address when applying for the rental license. I'm wondering if this is because of the variance on the property, or because we haven't closed on the house yet. 

Hoping for any insight into this situation if you are familiar with it. Thanks!