The ACH Pull transaction must be initiated by the account that will receive the deposit, not by Nomad.
The link must be made through micro-deposits that must be deposited in your Nomad account.
You will need to confirm the amount of these deposits with the bank to prove that you have access to both accounts. After this verification, the two accounts will be linked and you will be able to withdraw money from your Nomad account from your other account.
Nomad does not charge any fees for this transaction.
To see your account details, simply go to "Profile" > "Banking details" > "Banking account".