Hi there, ianclapham. The Error 9999 you encountered is a reported script error that occurs when there is a disruption in the connection between your bank and QuickBooks Online.
This error is only temporary and should resolve itself within 48 hours. Since it's been a week, I recommend contacting our customer care support to diagnose the root cause of this. You can also consider signing in to your bank's website to check if they have any system maintenance.
Here's how to contact our support:
For future reference, I'm adding these resources as a guide in handling your transaction in QuickBooks Online:
Contacting our dedicated support team will help resolve the error and ensure you can continue your tasks. If you require further assistance with your bank transactions, comment below. Have a good one!
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