They require it.
https://www.att.com/support/smallbusiness/article/smb-my-account/KM1227796/
The account owner or Retail Authorized User needs to meet these requirements to manage a wireless account in a store:
Must provide a valid government-issued photo ID, which includes a driver's license, passport, or alien Registration Receipt Card with photo
May be required to provide the wireless security passcode or other information