Date & Time: 6/7/2019
World name: Faerie
Character name: Ven Valentine

So there's not really much I needed to detail with this, and to be honest, I'm not really sure if this was intentional or not.

Recently, I leveled Blue Mage, and was going to run through A Relic Reborn: Chimera with some other Blue Mages to learn the Dragon's/Ram's voice when I noticed that it wasn't in my duty finder list, even though A Relic Reborn: Hydra was. When someone else as party leader tried to queue, it said someone didn't meet the requirements. I had to start a new Relic Reborn quest with a different job and get up to that point to unlock the duty when I had already done that quest twice with Summoner and Scholar.

What I realized was that when I did those quests back in 2.0, before the A Relic Reborn: Chimera fight was a duty. Before, it was this unusual raid that you had to manually build a team for and go to in Central Coerthas.

Essentially, if you cleared the content back then, but haven't done it after the fight was redesigned to be a queue-able fight, the game actually thinks you haven't unlocked that duty. It's an extremely niche circumstance since it requires the player have cleared content from a very long time ago while never attempting to clear it since then, but I think it's a little weird that the game doesn't let you into that Raid even if you've already done it.