QuickBooks Direct Deposit is not working can stem from various issues, such as incorrect payroll settings, outdated software versions, or bank information errors. To troubleshoot, ensure your software is updated, verify employee bank details, and check that direct deposit settings are correctly configured. Additionally, ensure that funds are available in the account used for payroll. If the issue persists, contacting QuickBooks support for further assistance may be necessary to resolve the problem efficiently. For persistent issues, consult QuickBooks support or a certified professional for assistance at 1.855.409.2300.