Heavensward upgrade on Steam From Legacy Version

Wondering if anyone can help what seems to be a real serious issue i have.

I had the original XIV so got given ARR as a free download by SE. After changing pc's I had to get ARR again and opted to get it through Steam. Of course when getting Heavensward I have to get it through Steam as that is what I have ARR on.

The problem I have is that on Mog Station it only recognises that I have the Legacy version and not a Steam version of ARR therefore it isn't accepting my early access code for Heavensward.

Any help appreciated.

steam has the code version for Heavensward and your arr through steam client u will have to register that I would believe on the steam client to allow it to accept that version but I am not sure