I own FFXIV on PS4 and PC, I accidentally created a separate service account for each platform when I go to add my windows version to my PS4 one it says "The entered code has already been registered."

I'm assuming this is because I made 2 separate accounts, Is there any way to correct this so I can link my PS4 account and my PC one? I really don't want to have to lose one account or pay 2 subs