A quick scan over the forums and there are SO many others in my position. Cannot register game because of region locking. Yet every one of us is being ignored.
We all bought our copy legitimately, yet we are not able to register our legal copy because Square Enix will not address the region locking issue!

I personally am taking it to Consumer Affairs here in Australia, as the game I have, that was bought in good faith is not usable, and no refund or exchange of service has been offered by Square Enix.

I advise everyone else in the same position to also contact a legal channel to get this addressed.