Hi there, stefanc-comprehe.
 

Possible reasons regarding the OTP maybe your bank recently made some changes with their security feature or connection. As much as I'd love to check your account information to review your banking information, we recommend reaching out to Nedbank. 

Once done, you can go to the Banking menu and connect your new Nedbank account from there. 

I'm adding this article in reference to connecting your bank account: Connect bank and credit card accounts to QuickBooks Online.

Also, to help you manage your transactions and ensure that they are accurately matched and categorised, here's the article you can open: Categorise and match online bank transactions in QuickBooks Online.
 

I've got your back with other banking concerns you might encounter in the future. Feel free to tap me anytime.