Your username is your student ID or a variation of it. See the table below.

Username format
Microsoft 365 Online
Student Email, Office Online, OneDrive file storage, etc.
CampusNet    After logging in with 365, go to and click the Microsoft 365 login button.
Course content (assignments, quizzes, etc.)
Self-Service000123456Course registration, Transcripts, Final Grades

If you need to reset or change your password, please see this article