Is this your first time here?
You can also log in with your AMBS G Suite account. (G Suite is the suite of programs formerly known as Google Apps--Google Mail, Google Drive, Google Calendar, and a few other things.)
Note: if you have changed your email address in Moodle, or if you do not have an AMBS email address, then you won't be able to sign in with your AMBS G Suite account. Log in using your Moodle username/password, or use the password reset link to reset it.