Is there a reason this is not available through the SE online store or through the PS4 itself?

I'm trying to get a code so my fiancé can play her account on the ps4 and cannot find a place to purchase a code for it, as it seems to not be included with the 50% off sale on SE's store.

I don't want to buy a physical copy of the game as I don't need it. Heavensward is already installed on my PS4 because I purchased the digital version when it first released, all I need is a code so she can access it.

Thanks for any help in advance.