We had the same issue last August, get rejected our first application because of Australian PCC, even though my partner only lived less than 6 months in Victoria and Queensland and never held a driver license there.
Couldn't really find any indication regarding how long you have to live there to be considered as a resident so when we reapplied in December, to be safe we tried to provide both, on top of the AFP National Police check.
The letter from VicRoads was quite easy to get, you inquire online and they send you back a letter stating you never held a driver license in Victoria State.
For Queensland, was a bit of a nightmare and to this day still no answer from them so when we applied we wrote a LOE with all the efforts made to get it.
Fingers crossed now.
Good luck !