The Frontline Absence Management system (formerly Aesop) is updating and will require substitutes to create a new alphanumeric username and password to sign in instead of using a numeric user ID and PIN. Third-party systems, like SubAssistant, can't use your new alphanumeric username but will continue using your phone login ID and phone PIN.
This means you must enter your 10-digit phone number and your 4-6 digit phone access PIN when linking an Absence Management account to SubAssistant. Please note that even though you cannot access your account using your old user ID and PIN anymore, SubAssistant still can.
If you cannot remember your phone access PIN, you can find it in your Absence Management account under Preferences > Phone Credentials