Hi @PhilipV ,
When the firewall is configured as DHCP Server and receives a DHCP Request with Option 82, Palo Alto Networks firewalls do not support this and do not include Option 82 field in the DHCP Offer.
There is however an existing feature request for this. I recommend that you reach out to your sales rep and have him/her add your vote to this request.
Feature Request ID: 10792 (Support for DHCP Option 82).