Last week I walked into the priority queue at SYD with print-out in hand only to get to the counter which displayed a closed sign.
I then retraced my steps and lined up with everyone else.
When I was served I asked what time the priority opened and the agent told me it is always open and just line up and they would have served me next. I asked if they could change the signage (maybe remove the closed sign?) but he just shrugged his shoulders .
It was after passport control