What I have been seeing is that someone is saying that codes are no longer left for the FFXIV EA. He is wrong, in his post he is showing you and error code 2. Which means someone has literally used that code to access FFXIV already.

As for those of us who are left battling in the trenches with Error 3. This is a Square-enix server problem. In which the server(due to congestion or influx of entries) cannot process all of the requests. Most likely to a rented out sever

Error 3 is a catch all code. If you understand Java console you can look into why your is rejected. In my case I have 3 codes in which it registered my 6-3-6-3 code but never game me my 20 digit code.

My error code shows this.

Object {success: 0, message: "An error has been encountered", result: Object}
message: "An error has been encountered"
result: Object
message: "Code already registered by the user"
plugin: Object
status: "OK"
__proto__: Object
success: 0
__proto__: Object

Here is what happens when it uses your code

Object {success: 0, message: "An error has been encountered", result: Object}
message: "An error has been encountered"
result: Object
message: "Code successfully added"
plugin: Object
status: "OK"
__proto__: Object
success: 0
__proto__: Object

Aside from all this still Error 3..

No Service Account

When you are being told you have NO service account that mean you have not yet obtained you 20 digit code after you enter your 6-3-6-3 code. If you think you got that code and it is not in your email ATTEMPT to re put in your 6-3-6-3 code and it should show you your code again on the next screen. After you get that code go to the mogstation to add to your account.

With all my attempts at making this work I believe I have 3 PS3 EA codes left which I am willing to part with.