Setting up Google Authenticator as second factor for VPN

Android

Search for Google Authenticator in the Google Play Store and tap Install.

Open the app and tap Get started.

Tap on Scan a QR code.

1. Allow the app to take pictures and record videos by tapping While using the app or Only this time.
2. In the browser of your other device (i.e. laptop) that you want to use VPN on, open the form Setting up second factor. 
3. Click on Setting up TOTP authentication app.

Now scan the QR code displayed there with your mobile device.

Confirm with ADD ACCOUNT so that the authentication key is added to the app.

An account with the name ZID (ZID Universität Wien: UserID) has now been added to the authentication app. Below this, a one-time password is displayed, which is renewed every 30 seconds. The amount of time you have until the next one-time password is generated is shown in the circle on the right.

Now enter this one-time password in the One-time password field of the form and click OK before the time expires.

iOS

Search for Google Authenticator in the App Store and install the app by tapping GET.

Open the app and tap Get started.

Tap on Scan a QR code.

Tap OK to allow access to the camera.

1. In the browser of your other device (i.e. laptop) that you want to use VPN on, open the form Setting up second factor. 
2. Click on Setting up TOTP authentication app.

Now scan the QR code displayed there with your mobile device.

An account with the name ZID (ZID Universität Wien: UserID) has now been added to the authentication app. Below this, a one-time password is displayed, which is renewed every 30 seconds. The amount of time you have until the next one-time password is generated is shown in the circle on the right.

Now enter this one-time password in the One-time password field of the form and click OK before the time expires.