Cannot buy Digital Download of PvZ in Xbox Store in Australia?

I bought the console from EB Games Australia and I bought the game on the xbox store (in Australia).

Why would a digital download from the xbox store be region locked?

Ok, then why do i have the option to buy a digital copy of each game, including Gears 1 and 3?

If i go to the store on my xbox one console, i have the option to buy the game.

So i can buy them from the xbox store but i cannot use a redeem code for them.

Also, when inserting the Gears 1 disc, it downloads the digital game on my xbox one as per the console's requirements.

Where does that download come from?

If you buy it on the Xbox store, it will download digitally.

I would love to go digital but living in Australia, digital can be up twice as much for a game. Even with new games it's out of control. I can buy the new call of duty aw at my local target store for $64. On the Xbox store it's $100.20. There is just no
justification for those prices. No disc. No transport costs. No nothing except digital storage. It's blatant greed!

Ok, then why do i have the option to buy a digital copy of each game, including Gears 1 and 3?

If i go to the store on my xbox one console, i have the option to buy the game.

So i can buy them from the xbox store but i cannot use a redeem code for them.

Also, when inserting the Gears 1 disc, it downloads the digital game on my xbox one as per the console's requirements.

Where does that download come from?

If you use the physical disk you are only downloading the emulator patch

Not the game