Unable to register. Maximum number of duties exceeded.

[Hasrat]

you can avoid using duties for that by using Stone Sea Sky, it also resets cooldowns (though i haven't tested if BLU can activate it)

Not remotely useful in this situation.. or any, really? You have to travel completely out of the way, likely to an entirely different zone, to find the specific NPC to gain access. The point of enter-leaving a duty is that it takes 10-15 seconds max, can be done while in combat without interruption, from anywhere in any zone, and can be initiated as soon as long spells (commonly Death or Ultravibration) are used and on cooldown.