Thanks for reaching out to us, @tim194.
Error 9999 is a script error that interrupts the connection of your bank and QuickBooks Online. To get this error sorted out, you'll need to disconnect your account and re-connect.
Here's how:
After that, you can go ahead and reconnect your account.
To do that:
You may take a look at this article for more information: How to add and connect bank and credit card accounts.
Plus, if everything looks good, you can utilize these pages that will help you manage your banking transactions:
Feel free to reply to this post if you have additional questions about managing your bank account in QBO. We'll be willing to lend a hand. Thank you, and enjoy your day.
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