On Monday morning, the Centrify iOS mobile app was updated to version 20.1. Customers have reported issues impacting users, so it has been removed from the App Store. Centrify engineering is urgently working on a new version. Currently we are targeting this being available on Tuesday May 5, 2020; however, this is subject to change. Updates will be provided here.
For more information and a workaround for the 20.1 iOS version, please see KB-32845 for more information: https://centrify.force.com/support/Article?id=ka01E000000TmQh