You need your personal QR code to use the card issuance machine. You can get this code via your account in the ZEDAT portal, Student Records and Registration Office.
The QR code is displayed via a link. You can scan it at the card issuance machine on a smartphone or tablet. If you do not wish to use a mobile device, you can also print the letter and scan the code that way. You can use any computer pool at Freie Universität to do this.