Is Heavensward Region lock as well?

[Seraphyna]

Actually, no. It shouldn't make a difference. The code is the important part, and once it's registered to an account it doesn't matter if it's EU, NA or JP. I've never heard of a 'region locked' expansion to an online game, and it would be rather foolish to start now.

This is incorrect. SE account that is EU needs an EU copy. SE account that is NA needs a NA copy.

[Laraul]

This is incorrect. SE account that is EU needs an EU copy. SE account that is NA needs a NA copy.

Where does it state this?

[KirakunAUS]

Where does it state this?

It is based on experience
NA codes and EU codes for the game differs from one another.

When ARR was first released, pre order codes differ from one another and it was region specific.

Unless it is stated like bonus item from Soundtrack, Art Book and Delivery Moogles, it is always safe to assume that these codes are region locked.

Again, based on experience

[Dalmacus]

Hey guys to avoid confusion i took the liberty to email square enix support and i can confirm that it is account region locked. If you have an EUROPEAN account you need an EUROPEAN game/digital codes for it to work. Likewise for US and JAPAN.