I am currently having a nightmare with Xcode trying to set up App Groups I previously had it set up but since I upgraded to Xcode 7.3 it has now broken. I get the error message "You don't have sufficient permissions" I haven't enrolled in the developer program but I know app groups you don't need to use them. This is what is shown inside Xcode inside the permissions.
Can't add App Group containers to App Id
I have the same problem. I want to re-use my app group for AW extension but it is not possible now.
I am stuck exactly at the same place. I can not figure how to solve this...