Thanks for bringing this matter to our attention, Race-MX. We know how important it is to connect your bank to QuickBooks Online (QBO).

To begin, allow me to share some information about Error 590. This error is temporary and only occurs when your bank is under website maintenance or updates, which lasts for a couple of hours. That said, I'd recommend connecting your Fidelity Bank to QuickBooks after 24 hours.

However, we can manually upload your transactions to QuickBooks if you require urgency with managing your transactions.

Also, I'll add this article that you can check if you need help with reviewing and arranging your data in QBO: Categorizing online bank transactions in QuickBooks Online.

Don't hesitate to reply to this thread if you require more assistance with bank connectivity. The Community space is open 24/7 to help you.