It is a REAL ID requirement. It is federal law. States issuing REAL ID compliant identity documents must mail them to your physical address. USPS provides that data for address validation.

DPVCMRA = delivery point is a commercial mail receiving agent. Any sort of location with PO Boxes.

https://developers.usps.com/addressesv3#tag/Resources/operat...

Disclaimer: I used to work for my state's DMV.

As someone who spent years homeless off and on, I resent REAL ID discriminating against the unhoused, so I choose to use my privilege to reject it. I do not have or need REAL ID and my passport does not need a current residential address.