We require everyone to provide an FCC Registration Number, also known as a FRN. The alternative is giving us your Social Security Number.
#1: You shouldn’t want to give your SSN to us.
#2: We do not want to accept your SSN because we don’t want to be responsible for it.
Therefore, we require everyone to register with the FCC prior to the exam session and bring their FRN to the VE exam session.