containerURLForSecurityApplicationGroupIdentifier returns nil on iOS Simulator

Question

Context

With iOS8 and extensions Apple introduced the App group containers (more info here).

Problem

We use it through NSFileManager\'s

Answer 1

For me there was some mess with my iOS Team Provisioning Profile (which is not required to run in Simulator).

In order to run my app on my iPhone I had to first reconfigure the iOS Team Provisioning Profile for the Debug environment. Calling containerURLForSecurityApplicationGroupIdentifier: worked perfectly fine on the device. Afterwards I went back to the Simulator and - there you go - it worked again as well.