Make sure when using your email you are using your username and not your full name.

e.g. John Smith who graduates in 2021. He should use l21smitj@allsaints.wa.edu.au, not john.smith@allsaints.wa.edu.au.

Also double-check that you are using your All Saints' Password.

(If you are not sure what your ASC Username and Password is, see: What is my Microsoft/All Saints' username and password?)