Venmo does not currently allow two separate users to have the same bank account added to their accounts for security reasons.
If you'd like to transfer the joint bank account from one Venmo account to the other, we can help! We'll just need the consent of the owner of the Venmo account currently using the bank account. Please have them email firstname.lastname@example.org with the bank name, routing number, and last four digits of the bank account authorizing the release of the account. Once the bank account is released in our system, it will be available for another user to add.