As of today, Concierge for iOS version 1.1.4 has been upgraded to work under iOS9.
If your device is installed with iOS9 and later, this is a required upgrade as prior versions of Concierge will experience login and/or connectivity failures while running under the new release.
If your device is installed with iOS8.x, this is an optional upgrade, but is one that fixes at least one crash scenario in the app.