In Minecraft Bedrock Edition, the item "Ominous Vault Key" can be accessed via Creative mode or commands. However, the "Ominous Vault" block/structure itself is completely missing from the game. It cannot be obtained via /give, it cannot be copied in Creative, and it's not in the inventory either. Please either add the Vault itself, or remove the key until it has a function. It’s currently confusing and incomplete.
MCPE-226016
Ominous vault cannot be obtained via /give or the Creative inventory
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The ominous vault is a block state of the vault block, which is why it cannot be obtained via /give or the Creative inventory. You can use the /setblock command to place an ominous vault: /setblock ~ ~ ~ vault ["ominous"=true]
However, the ominous vault won't accept ominous vault keys due to a bug (MCPE-180338).