DT66 no need for apologies!
I do wonder though, seeings deadline was Monday, if you have had any success?
After spending many, many hours following MYOB's instructions & awaiting info to filter through into individual MyGov accounts, only to realize their support notes were not working. I lodged a case with MYOB support to be advised that in actual fact a new file file (subscription) needs to be created to enable STP finalisation!
I am currently still in the process of getting my figures for the first branch back to what they need to be, importing 45 employees into the new file, manually inputting TFN's, it has been a nightmare of a task.
I hope by this time next week, I can say that I have found a solution!?