iOS 8 beta 5 Game Center Sandbox won't recognize my app

Question

I trying use GC sandbox in game, on iOS 7 it works fine, but on iOS 8 beta5 GC authentication return error \"The requested operation could not be completed because this app

Answer 1

If you aren't seeing the sandbox switch under Settings > game center (developer section), then you need to connect the device to XCode

OR: Use Apple's testflight iOS app found here on the App Store: https://itunes.apple.com/us/app/testflight/id899247664?mt=8

That will enable the developer Sandbox switch as well. Using the old testflight web link tool on iOS doesn't enable the sandbox switch.