I'm here to help you fix the bank error 591 for your American Express Business Account, @NUMBERS3.

Error 591 can be caused by the following:

• Bank server
• Damaged company file
• Damaged QuickBooks

To verify what causes the error, you can log in to your AMEX bank through the web. If successful, you can return to QuickBooks Desktop (QBDT), create a sample company, and then set up your AMEX bank account.

If you still encounter the same problem, you can return to the original company file and run the verify and rebuild tool. After that, you can set up your AMEX bank again. 

If the issue persists, you can repair your QBDT.

In case you need guidance when reconciling an account in QBDT, you can check out this article: Reconcile an account in QuickBooks Desktop.

Please hit the Reply button if you have a follow-up concern regarding bank error 591. I'll be there to assist you.