In a scenario with a desktop browser and a mobile device, it is no problem to scan a QR code with the mobile from the screen. Doing the same thing in a mobile-only scenario will not work.
To support the mobile-only use case, Airlock IAM is able to use the custom protocol mechanism of the Android and iOS operating systems and send the activation challenge directly to the Airlock 2FA app.
An additional button Open Airlock 2FA App is displayed in the token enrollment web UIs (token migration in authentication flow and protected self-service) as shown in the following screenshot.