Need help with quest “kill them all!” for netherwing rep

Im gettin rep with the netherwing to get the mounts, i reached revered and noticed i have to join one of the shattrath city factions to get the quest “kill them all!”

I go to shattrath city and do the quest “Allegiance to the Aldor” but when i go back to taskmaster varkule he is not giving me the quest “kill them all!” :(( (i have commanders badge)

What should i do?

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