QuickBooks software, no doubt, has driven a revolution in the accounting domains and businesses. However, innumerable errors and glitches are associated with the QuickBooks software that keeps impeding your work progress recurrently. QuickBooks also has many different functions like the pre-authorization of electronic funds and time tracking options for employees, and these functions have always proved to be useful for its users. Sometimes, users might face problems due to some technical glitches in the software. So here, in this article, we are going to discuss one of the common errors found in QuickBooks i.e. QuickBooks banking error code 9999. It is reported as a script error that corrupts the connection between the bank and QuickBooks Online.