Question: When we receive a push notification on the IOS SSO APP, what are the ways we can approve the notification ? 

Answer:

When Screen is Locked
Option1: Click the notification, unlock the phone and you will be in the SSO APP, then hit Approve - then hit the home button to close the SSO APP.
Option2:  Users need to either force touch (3D touch) or slide the notification to the left ,more and approve or long press and approve

When Screen is Unlocked
Option-1: Drag Down on the notification and Hit Approve.
Option-2: Click the notification, you will be in the SSO APP, then hit Approve - then hit the home button to close the SSO APP.

Note: The app might prompt for Touch-ID/Face-ID/Passcode as an extra factor in which case the app is always launched into foreground.