There are currently a lot of people unable to advance the izanagi questline. In my case, on 1 character, I obtained all 3 keys. Ada of course doesnt offer the keymold even though forges are rotating. So, I reluctantly went about trying to unlock all the forges (since that's how you originally obtained Izanagi's Burden and I had the quest from before shadowkeep launch). Much to my dismay, 3 steps into the gofannon forge questline, when you have to run lost sectors to kill forge bosses, my game will inevitably throw me back into orbit as soon as I hit the boss. Ultimately resulting in me not being able to advance my quest to unlock forges OR receive the keymold from ADA by any means. I suspect it has something to do with the questline being "deleted" (for lack of a better word), once forges started rotating. TLDR: It really doesnt seem possible to obtain izanagi's atm. I wouldnt know if that applied to people who already have the mold though. Pray Bungie can help resolve this matter swiftly.