Ok guys, here's what's happening:
Yesterday, I decided to do the PS3->PS4 upgrade, followed all the steps on the US PS Blog, downloaded the client without any trouble. And now that's downloaded, when I input my Square Enix id credentials it presents me with the following:
"No valid service account is available to play FINAL FANTASY XIV: A Realm Reborn.
In order to play, you must first purchase the digital download from the PlayStation Store or register a product code.
*Please restart the client for FINAL FANTASY XIV: A Realm Reborn."
And I don't get it. :[ To recap: I did the upgrade process through Mog Station, they gave me the product code which I then used at the PlayStation Store and the client downloaded successfully. What am I doing wrong, GAF?