Does IApp.Back Method work on iOS?

I am using IApp.Back() method in ui testing. It works on my local iOS simulators, but not in the Test Cloud.
I am getting
System.Exception : Error while performing Back() ----> System.Exception : Error while performing Tap(ClassFull("UINavigationItemButtonView")) ----> System.Exception : Unable to tap element. Query for ClassFull("UINavigationItemButtonView") gave no results.