3820052 - Why does my car confirmation number from National not work on the vendor's website?

This article explains how National confirmation numbers are generated for reservations made through SAP Concur and what to do if the confirmation number is not recognized on the National website.

I entered the National confirmation number from my SAP Concur itinerary on the National website, but my reservation cannot be found. , KBA , CON-CA-TLS-IEM-IMP , Import Credit Cards , CON-CA , Cross Applications , CON-CA-ADM , Administration , Problem