If you already have a SWITCH edu-ID account, you must link it to the University of Zurich.
You can link to the UZH account at https://eduid.uzh.ch/linking/.
The SWITCH edu-ID:
You can find instructions for configuring the 2FA here: https://help.switch.ch/de/eduid/faqs/?lang=en#mfa
For security reasons, we recommend that you select the "Always" option when configuring the 2FA.