Users may encounter a QuickBooks Error 40001 when trying to update payroll or get employee data. Most of the time, it's caused by wrong login credentials or authorization failures. To fix it, confirm your Intuit account, upgrade QuickBooks, and make sure you have a reliable internet connection. Administrative access and adequate credentials are essential. If you wish to speak with a QuickBooks support expert right away, please call us at +1.833.802.0002.