Is this your first time here?
For new user, kindly login the platform using your Microsoft Account (firstname.lastname@example.org) to create new profile.
For those already having account, login to existing account and edit your email address (edit profile) to your Microsoft account and next time you can just login with the same (by clicking the [Microsoft] button).
For existing user, click here for Details guide on linking account.
Have problem to login? please contact MUCM IT Department.