QuickBooks encounters QuickBooks Error 80040408 when it is unable to launch correctly in multi-user mode. This issue typically occurs when QuickBooks settings are incorrect or when the application is not set up to run with compatible software. Updating QuickBooks, verifying correct multi-user configuration, and examining startup settings are all examples of troubleshooting. To get expert QuickBooks assistance over the phone, call 1.855.738.2784.