Nostalrius Begins - Quality wow vanilla realm (1.12)

Today I completed the Warrior Brutal Armor quest, but the NPC (Thun'grim Firegaze) will not allow me to turn in the quest. The quest is marked as completed in my log, and I have all the items necessary for the quest in my inventory. A warrior friend who I was questing with was able to turn the quest in without trouble. Can a GM resolve this issue? Thank you.

you should try putting the q items into the bank, abandon the quest, delete WDB, go take the quest, go take the items from the bank and go back to turn in the quest. Did work for me two or three times during leveling on hand-in quests.