Same here - and the travel manager for our organization, who signed the agreement with National (Enterprise) has no idea why the portal is asking for this. She reached out to her account manager, and she did not know either, so she's checking further into it... As our corporate (on duty) code is set up only for direct billed rentals, it's a bit of frustrating to wait for an answer... Basically in the position of paying retail for a pickup this week .