Hello Helen,
The error is triggered by the added security feature implemented by your bank. Currently, we can have seamless bank feed updates for bank connections which only require username and passwords. If the bank implements another layer of protection like passcodes or 2-factor authentications, you'll need to enter them every time QuickBooks tries to download an update. By the way, QuickBooks downloads transactions nightly.
In a setup like yours, you can click the Update button when you want to download new transactions from your bank. Then, enter your security code when prompted. Another option is to download your transactions from your bank's website in a supported web connect format. Then, upload them to the Banking feeds. You can do this on a weekly basis.
Please let me know if you have other questions in mind.
