You actually should not need an eligibility ID. If you are scheduling an appointment online and see the screen below, it means that ASE and Prometric need to sync your test registration information. We apologize for the inconvenience.
To get the problem fixed, please call ASE Customer Service at 1-800-390-6789 from 8 am to 5 pm, Eastern Time, Monday through Friday. Or send us an email at email@example.com.