I have completely changed the way how players can receive the https://www.db.pandawow.me?item=100948/skeleton-key.
Once players defeat https://www.db.pandawow.me?npc=71658/korkron-jailer any player will be able to click on him (instead of looting him) and receive the key (with condition that player has some free space in bag).
@QA Team, to test this easier, I have reduced the required amount of players needed to transition boss into phase 2 to 1 player on PTR.