I appreciate that you've taken all the steps provided, @bkim_gitauto.

The Banking Error 571 occurs when you close the consent page while connecting to Open Banking in QuickBooks or when active pop-up blockers in your browser prevent the process from completing the banking connection.

Since you encountered this issue last June and already performed the recommended steps to fix this, and the error remains, I recommend contacting our Technical Support to conduct a thorough investigation and check your account in a secure environment.

Here's how:

1. Sign in to your QuickBooks Online company.
2. Select Help at the top right.
3. Select or type Contact Us.
4. Enter a brief description of your concern.
5. Choose a way to connect with us: Start a chat or Have us call you.

In the meantime, you can manually upload your bank transactions using our Web Connect feature to input the transactions.

Additionally, you can check this article to assist you in reviewing and categorizing transactions:  Categorise online bank transactions.

Please let us know if you have other questions about banking concerns. I'll be around to assist. Stay well.