The following table lists all services and platforms that currently use 2-factor authentication in some form. Here the options in the last column mean the following:
Mandatory - Means that the process can only be performed with 2FA enabled and using 2FA.
Optional - Means that the process will ask for 2FA if it is enabled. If you do not use 2FA yet, you can log in without it.
Service/Platform
Process
2FA-Login
EduVPN
Login/renewal of the certificate
Mandatory
Webmail (Trier)
Login
Optional
Spamblock (Trier)
Login
Optional
SSH-Access (Trier)
Interactive ssh session
Mandatory
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