PS4, obtained the Black Armory Key Mold on Hunter shortly after receiving the pop up that the Bergusia Forge has been unlocked. My Warlock and Titan, however, did not receive that system wide prompt after logging into those characters. Bergusia Forge was unlocked on the maps for all my characters after the Hunter received the Mold. Could this be because the Mold was pushed account wide instead of character wide? I hope my information helps.