The macOS system must disable iCloud Game Center.

This works only with supervised devices (MDM) and allows Apple Game Center to be disabled. The rationale is Game Center is using Apple ID and will share data on AppleID-based services; therefore, Game Center must be disabled. This setting also prohibits the functionality of adding friends to Game Center.

Verify the macOS system is configured to disable iCloud Game Center with the following command:

/usr/bin/osascript -l JavaScript << EOS $.NSUserDefaults.alloc.initWithSuiteName('com.apple.applicationaccess')\ .objectForKey('allowGameCenter').js EOS

If the result is not "false", this is a finding.

Configure the macOS system to disable iCloud Game Center by installing the "com.apple.applicationaccess" configuration profile.