I don't recall if there was a password required for the "normal" operation of the pollpads, once they were setup.
There was an 'elevated access" password that only the poll manager had and the Dominion IT guy that could access different configurations within the "poll pad" which is just a basic Apple Ipad with a custom config.
The Ipad registered over the cellular network with a VPN tunnel to the county EMS server.
It was real time information from the county election database.
(worked the polls in 2020 in GA)
The poll pad setup cellular network is found in a youtube video if you're looking for confirmation.
No one working the polls needed an elevated password for anything unless there was a problem.
https://youtu.be/lX-eBWtzC-k