Thanks for posting!
A 'user is not currently valid' message in ESS usually involves the staff account currently being inactive in the Human Resources system.
Your first step in this case should be to contact HR and inquire further. If they require any further information from you to clarify, they will let you know.
Phone: (03) 9925 0600 (ext 50600) - 8.30 am to 5.30 pm (AEST) Monday to Friday