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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 application is not recognized by Game Center". In production GC work fine on iOS 7 and 8 beta5.
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Create a Sandbox Tester Account Sign in to App Store Connect. On the homepage, click Users and Access. Under Sandbox, click Testers. Click “+” to set up your tester accounts.
Go to Settings > Game Center > Sign out and sign back in. If it continues, try connecting to a different Wi-Fi network or try from cell network. You can find additional details in. For the issue with Wallet and if you're still unable to connect to Game Center, reach out to Apple directly.
In macOS, the sandbox account appears in App Store Preferences after the first time you use the device to make an in-app purchase. Open App Store > Preferences and click the Sign In button to sign in using a Sandbox Apple ID. When you're done testing, sign out of the Sandbox Apple ID from the App Store Preferences.
The only way to find out is to login with every known account. Gamecenter accounts are easily changeable and doing so doesn't affect the rest of your device because your Apple-ID/iCloud login is seperated from your Gamecenter account.
You should turn on the GC sandbox mode.
go to settings --> game center
scroll to the bottom, there is a "sandbox" swith under "developer".
(Important! - These developer options are hidden until you have connected the device to XCode 6. If you didn't use XCode and deployed your app in some other way - e.g. Testflight, iPCU, iTunes, then you will not see these options)
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