How to create Atomic Wallet private key from their ETH address using 12 words mnemonic?

[b4theRapture]

@ebellocchia commented on Atomic Wallet address derivation from a mnemonic:
#19

I already know my address, but I would like to generate matching private key (since Atomic Wallet has their app suspended from download).
I feel there is one step further that can be done to derive matching ETH address private key as well (that can be imported in MetaMask). Please help.

[ebellocchia]

Hi,
yes I remember that Atomic wallet derives the Ethereum address in a quite "strange" way.
If I remember correctly, it basically just uses the master private key as it is without deriving any private key.

[b4theRapture]

Thanks @ebellocchia
Atomic Wallet has reinstated downloads of their App, so I was able to get my private key that way.