enum class XblPermissionDenyReason  : uint32_t  
{  
    Unknown = 0,  
    NotAllowed = 2,  
    MissingPrivilege = 3,  
    PrivilegeRestrictsTarget = 4,  
    BlockListRestrictsTarget = 5,  
    MuteListRestrictsTarget = 7,  
    PrivacySettingRestrictsTarget = 9,  
    CrossNetworkUserMustBeFriend = 12  
}