When you have registered , please check your profile under "Edit profile" to make sure that your card number is listed correctly.
The database we are pulling data from, is not always up-to-date, and might have failed in picking up your DTU access card.
Or if you do not have an access card yet, you can add it to your profile, as soon as you get your hands on it, as our data-base dose not auto fetch new data.
You can always check your card status on:
https://cardadmin.cas.dtu.dk