Error when adding payout account details

Hi, I am assisting a friend to setup payout preferences and entered the bank account for direct deposit. I keep getting the following error. Reference #97.21083e17.1467246928.2d661d33
I have no idea what it is. The account details are correct, BSB, account # etc as per bank statement form the bank. Any ideas? Airbnb help is useless and I have no idea how to contact airbnb helpdesk.

I’d give Twitter ( a try. At least they respond. Whether they will fix the problem of course, one cannot say.