Amazon US promo code not valid on Amazon AU?

Hey guys, saw a good deal on a mousepad that's currently on Amazon US:

It appears that the product does ship to Australia but only if you use the Amazon AU site to purchase it. However, the promo code seems to only work on the US site. I believe it's because the difference between the seller (on US site it's sold by AUKEY themselves but on AU site it has to go through Amazon US so the seller is listed as Amazon US instead of AUKEY). Has anyone had a similar problem before? Is there a way I can apply the promo code and have it shipped here with prime? Thanks!

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Amazon AU
Amazon AU