Registering as an enduser for the AuthNull
Most users should get an automated email as a part of user onboarding / synchronization with active directory or user import through CSV and LDIF files. That onboarding process should trigger a user registration link in which users can setup their AuthNull Accounts.
Users who require access to AuthNull to access critical infrastructure should register on the default registration screen on the org hosted AuthNull URL, or by contacting their IT administrators.