They scan the face to monitor who used the terminal.
The Empire is in ruins and there are many different factions, so they probably don't have records for every troop from offworld anymore.
They might not even keep such a database for the same reasons that the Rebellion wouldn't have - OpSec.
But... they'd probably be able to slice into official republic databases and keep tabs on their operatives.
They might not auth against a central Imperial database anymore, but they can certainly auth against their hacked Republic info and sound an alarm if they get a hit.