[grace-baker Hexnode 28 January 2020 grace-baker Moderator]

Hey, Thanks for reaching out to us. Happy to help.

Please navigate to iOS –> Restrictions –> Allow Application Settings. Disable the ‘Add friends in Game Center’.  This will prevent the user from adding friends to the Game Center.
To block the users playing multiplayer games on their devices, navigate to iOS–>Advanced Restrictions–>Allow Device Functionality. Disable the ‘Mulitiplayer gaming’ option.

Kindly use the help link for more insights into restrictions.

Cheers!
Grace Baker
Hexnode MDM