Thank you for reaching out to the Community. The bank error 103 can be caused when you try to log into your online banking, your financial institution website does not acknowledge the provided login credentials and displays error code 103. Please ensure to validate your sign-in credentials to prevent errors like this.
If the issue persists, I'd recommend connecting with our support team. They can determine further why Nedbank isn't working and escalate this case if need be.
I'm here to make sure you'll get the answer you need about the banking issue. Our QuickBooks Support Team is available live chat only every 8 AM-6 PM SAST, Monday to Friday. I'd suggest reaching out to them again by following the steps shared by my colleague.