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I found a solution. The issue is the thread pitch doesn’t accommodate Australian standards
Australian Thread pitch is 14 threads per inch, whereas the timer requires 11.5 threads per inch
Both Australian and USA have a 3/4″ thread size
To clarify
The timer needs American Standard
Tap (Faucet) Threads:
Size: 3/4 inch GHT (commonly referred to as “garden hose thread”).
Thread Pitch: 11.5 threads per inch (TPI).
Hose Threads:
These are straight (not tapered) threads, meaning they require a washer to create a watertight seal.
Orbit support should have this information with the device, so that customers, don’t have to search high and low to get it.
So, if you have this problem source fittings that are 3/4″ GHT and doubly check that the thread pitch is 11.5 per inch.