Thank you for following up in this thread, PatAdv.

As mentioned by my colleague Jen_D, this usually caused by the bank system that is undergoing maintenance.

Here's how you can update your bank's connection manually:

1. Log in to your QuickBooks Online Account.
2. Go to Banking on menu.
3. Then click on Update at the upper right.

This will help refresh your bank's connection into QuickBooks.

If you still see the error, wait for 24 hours and update again. Otherwise, you can reach our support team to help you connect your bank properly.

Let me know if you still have questions or clarifications about banking. I'm always here to help. Have a great week!