I have been able to make payments both test and live payments via the Make an In App Purchase V2 node and also successfully using the Read in app Purchase V2 node however the Query Owned Purchases and Restore in app purchases2 nodes just do not return any content.
By being able to make both live and test payments indicates my setup is correct therefore I can only conclude the Query and Restore nodes have bugs.
Without these nodes working I can not see how I or any game can release with IAP as there is no way a developer can determine if a player has made an IAP for such things as reinstalls, move to new phones etc