Plot hole: Before the IMF team can exchange the yellow cards for the access control, they first need to know the data format/file type in which the access rights (retina, gait, fingerprints...) are stored. Otherwise, the computer will not recognize the data on the card, and display an error to the maintenance personnel. In order to figure this out, they would need to steal first some of these yellow cards and analyze the data on them, before they can fake a card which will be accepted by the computer.
Suggested correction: Ilsa has already prepared everything; she just can't do the dive. She had lots of time to get the data format (and a yellow card) somehow, e.g., by charming the info out of a technician or getting hold of a discarded/demo card.
