The quest requires me to socket a medallion and (if I remember correctly) to queue for the battlegrounds playlist and hit the chest at the end. I can't queue for the playlist and continue the quest step. I tried doing a normal battlegrounds(not in a playlist) but nothing changed.
I have no idea if I'm having a brain-fart or this is actually a bug.
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Hey, You can abandon the hammer, and then pick it up again from the war table in the H.E.L.M. This should remove the medallion and allow you to progress the quest.
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Are you able to unlock another medallion for the hammer? You could socket a different medallion replacing the old one and it will progress the quest.
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Run a battleground playlist and use that at the end to get rid of it, then you can put another one in and continue with the quest.