Are you a professor at the university?
If so, you can obtain a free Yubikey from Service IT in room N106. You will need this key before proceed with the SSO registration process.
If you are a student or a lecturer at the university?
Then install please install a TOTP app of your choice on your smartphone or buy a WebAuthn security key if necessary. You should have installed a TOTP app before you log in to the SSO portal for the first time.
Which TOTP apps can you install? Please see our list below under „Token options: Tabular view“.
Deutsche Version: Token