Im having same trouble with confirming old account details. Could anyone please advise jow exactly i put in IBAN details (whatever that is).
Here is the place in your account were you can update your deposit method:
In order to be able to do this, you will firstly need to verify your identity by entering the previous bank account number in full.
The definition and more information about what does IBAN stand for can be found here: https://www.paiementor.com/iban-number-definition-structure-and-checker/ .
If you are unable to provide it for any reason, open a case with the Seller Support and they will offer you a different way how to do this - by supplying some documents to verify your identity.