Unknown 3023 Error Code

Anyone know what the Error Code: 3023:1012:6:377 means? Because of the 3023, I know it has something to do with security.

A little backstory. I had opened up an alt account for my girlfriend and purchased a copy of Path of Fire Ultimate on it. Since she had wanted the names of my toons from my main account (this one), I deleted the toons and freed up the names. This was Monday. I was able to log into both accounts then and, come Tuesday morning, I've been getting that error code when I attempted to log in to the alt account.

Can anyone shine some light on this? I opened up a support ticket on Tuesday morning and I still haven't heard a thing/can't log in. Thank you in advance.

Edit: both the Path of Fire Expansions on both accounts were paid with the same credit card (mine)

Here you go: https://wiki.guildwars2.com/wiki/Error_code

Because they are both Ultimate Editions, (and the odd transfer of character names), her account may have been flagged.Make sure she contacts the CS Team, as they will only discuss the issue with the account owner.

That is just so odd. But thank you for the response. Since I opened up the account (under my name) and I paid for the Ultimate, I am still the account owner then correct?

Yes. Doesn't matter who paid for the account; does matter who created the account (whose name is listed as the account owner).