I'll try it but I doubt it. I've had this quest for like 3 days and it won't go away.
Well, then I don't know how I can help you. It sounds a lot like that versus A.I. quest bug.
Blizzard is trying to fix the bug, so maybe describing it to them will help.
https://us.battle.net/forums/en/heroes/topic/20754327023?page=1