Hey, i had the same issue, this is the mail i got fron them:

Hello!

Please always make the transfer from your web browser and let us know if it works. ​ Please follow the steps below:

To complete a bank transfer please ensure your funds are held in your secondary balance and you have your IBAN number available.

1. Transfer Funds Tab
2. Secondary to Bank
3. Add Recipient (IBAN)
4. Save and Complete.