The Key to Karazhan II question

Hi dungeon/raid fellow, please help me with this.

I am doing The Key to Karazhan II while Kara10 in Ambershire, but I seemingly could not get the quest item (the key) dropped after killing Moroes. Information from database said 100% chance drop.

I saw raid lead picked it up, but when I clicked to Moroes corpse, the key was not available. Is that an Item need to distribute like gears (through rolling or ML assignment)?

[https://database.turtlecraft.gg/?quest=40818](https://database.turtlecraft.gg/?quest=40818)