Old legion quest: working with the wardens

Classes Demon Hunter
1
Hello,

I've created this character for BFA, so I mostly skipped the Legion part and grinded my way to 110 in order to reach the new content with little care for the older one.

However, now I'd like to get the nifty Slayer title (and perhaps later the class mount), so I went ahead to do the class hall quests.

Now I'm stuck with a quest named "working with the wardens" that asks me to complete five missions on my table. I already did four of them, they took about an hour to complete and the next one was then available.

But the fifth one: "Working with the wardens: Mellok, son of Torok" never popped. Not one hour later, not a day later, not a full week later.

I submitted a ticket but a GM answered it isn't a bug - ok, fine for me. But I read everything I could online but noone seemed to have a problem with this quest, so here goes: any of you remembers if there is something special I should do ?

Thanks a lot for your help ^^
2
Isn't there a follower in you class hall who give you the last quest?
3

issu? tank you