I appreciate you for posting here today. Just to clarify, what bank is connected to your QuickBooks? This way, I can check if there are any open investigations related to your concern?
The error 9999 is a script error that indicates there's a problem with the connection that Intuit uses to download your banking information. In the meantime, let's try some troubleshooting steps to get past this error.
To begin, log in to your bank's website to check if there are notifications or alerts that need your attention. If you updated anything on your bank’s website, updates QuickBooks as well. Once done, download your bank transactions manually so you can track them accurately.