swift - GKFriendRequestComposeViewController can't send request ('Send' grayed out) -


i have attempted implement gkfriendrequestcomposeviewcontroller players can invite other players game center within game app. able deploy gkfriendrequestcomposeviewcontroller , add playerids/emails recipient box. however, unable press 'send" , grayed out. still in sandbox mode. possibly missing here?

// helper function func presentgkfriendrequestcomposeviewcontroller(viewcontroller: uiviewcontroller, message: string!) {          self.presentingviewcontroller = viewcontroller                 let friendrequestvc = gkfriendrequestcomposeviewcontroller()         friendrequestvc.composeviewdelegate = self         friendrequestvc.setmessage(message)         viewcontroller.presentviewcontroller(friendrequestvc, animated: true, completion: nil)     }  // gkfriendrequestcompmoseviewcontrollerdelegate method func friendrequestcomposeviewcontrollerdidfinish(viewcontroller: gkfriendrequestcomposeviewcontroller!) {      self.presentingviewcontroller.dismissviewcontrolleranimated(true, completion: nil)            }

my problem invitation message string long. after shortening message, invitation sent. apple removes limitation or documents in future. of august 6, 2015, message maximum 140 characters.


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