Let's resolve the error you're having to add your bank accounts, @fwsherwood-fastc.
The piled-up cache in your regular browser might have caused this unusual behavior. You can try opening your QuickBooks Online (QBO) account using a private browser or an incognito window, then try to authorize your connection.
If it works, clear the cache in the one that you're currently using. Here's how to clear cache and cookies to fix issues when using QuickBooks Online. Once you're done, restart your browser for the changes to take effect.
Also, make sure that the one who's trying to authorize the connection is the primary account user. Follow the steps outlined in the How do I update my connection when it's time to switch? section for detailed guidance on how to authorize the connection: What's OAuth and what's changing with online bank connections.
If you'd encounter errors go to Step 4: Fix specific bank errors part of the following article to fix specific download errors: What to do if you get a bank error or can't download transactions in QuickBooks Online.
Once you get your latest transactions, you can now match and categorize those transactions and reconcile them to ensure your books are accurate and there aren't any duplicate transactions:
Let me know if there’s anything else that I can assist with your bank accounts by leaving a reply below. I'm always willing to help. Have a great day!
