2-factor authentication can be selected here for the profile.
An e-mail must be configured for the user. Furthermore, the notification service (SMTP server) must be activated.
Google Authenticator
This requires the GA app on a smartphone. A QR code for setting up the account in the app is displayed in the user area.
Radius
The Radius server must be configured for this.
SMS
To do this, an SMS service must be configured and a telephone number must be available