Thank you above player. This clarifies the confusion.
Disregard thread.
Printable View
Older players got a free Fantasia potion as part of their veteran rewards (reward for 30 day subscription).
That potion is now instead a quest reward for "The Ultimate Weapon" after the veteran rewards were revamped some time ago.
When a character was created does not matter. Those characters who finish "The Ultimate Weapon" after the veteran rewards revamp went into effect will get a Fantasia potion as a quest reward.
Like MistakeNot already pointed out, your "extra Fantasia" already applies to your account, as it is already flagged for the old 30 days veteran reward. When SE made changes to the veteran rewards, they moved the Fantasia to the last quest of the 2.0 MSQ, so new players would still be able to obtain a free one.
You're hardly 'missing out', since you've been getting that free Fantasia on every character, ever since you've subscribed for 30 days. The fact that you're also able to obtain the Fantasia from the MSQ (on characters that haven't done it yet) is just a cherry on top.
(Also, while I'm just nitpicking here, 'some time after release' is actually over 4 years after release, as the veteran reward change happened in 4.1)