Thanks for choosing QuickBooks Online (QBO) as the accounting software for your business, P Booth.

Let's fix the banking error you've encountered to connect your HSBC Business Banking account to QuickBooks Online (QBO). I'll guide you on how to do this below.

Error 571 usually occurs if you have a pop-up blocker activated on your web browser or if you suddenly close the consent page while connecting to online banking.

To fix the said error, turn off the pop-up blockers on your web browser and try to reconnect. Then, you can also refresh the page to ensure the permission page can load completely.

Please see this article to learn more about fixing error codes on your bank feed in QBO: Fix bank errors in QuickBooks Online.

Once your account is connected, your (latest) transactions automatically download and categorise. 

Additionally, I encourage you to reconcile your accounts regularly (every month). This helps monitor your income and expenses and detect possible errors accordingly. You may want to check out this article as your guide in doing and fixing reconciliations in QBO: Learn the reconcile workflow in QuickBooks.

Should you need further help or have other bank connectivity concerns in QBO, please don't hesitate to post a reply below. The Community is always ready to provide the assistance you need.