My D2 timeline is a little askew (D2 Console->PC->cross-save old Console data to PC)
That being said, I had heard there were bugs regarding the Izanagi's Burden questline for those who had not completed it in the original Black Armory release. I confirmed my suspicions after finally receiving and completing the rare bounty portion of the quest yesterday (10/30/19), then turning in the Obsidian Crystal to no apparent quest progression.
I confirmed in my review of my quest step on 'Lock and Key" that there was indeed no progression after consuming the crystal. Then went to the forums, finding myself affirmed in my depression at what I found.
Basically, I can't imagine that I speak for myself when I say this needs immediate resolution. This is a highly sought weapon, especially in the current DLC endgame content. I have personally been attempting to claim it for months as is. To finally get the opportunity just to have it squandered on a coding error is very frustrating.
At this point, just give out the gun?? I've heard there have been multiple patch attempts at this point, which don't appear to have worked.
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I went to consume the black armory key and nothing happened it is bugged.