Depending on which PC or network you are using, you might be asked to log in again. Always fill in your username in the format au[auid]@uni.au.dk, e.g. au12345@uni.au.dk. The two types of login boxes are displayed below.
You will now be asked for a two-factor authentication. Approve the login request on your phone. You can read more here. When you click ‘Approve’ on your phone, the screen shown below will disappear.