My wife and I decided to get back into FFXIV due to the recent Steam sale having SB for half off. I upgrade my account without a problem, but when my wife goes to upgrade hers, Mogstation says its an invalid key.

Both of our accounts were originally purchased through Steam. The only difference was I bought HW when it was the most recent xpac, while she never played HW. Everything I read says you can upgrade straight from ARR to SB, so I don't think that's the issue but what do I know? Anyone have any thoughts?