I've completed the job quest mission "Dragoon Sound" and I should have unlocked the action ability "Nastrond", it was part of the reward from the quest. The ability remains locked to me but I meet the criteria for it at lvl 70. I think I may be bugged as I had a similar issue with the "Mirage Dive" ability at lvl 68, but I was able to claim it later at lvl 69.