QuickBooks is a widely used accounting software, but like any software, it can encounter errors that may disrupt your work. QuickBooks Error 1406 is one such issue that users might face during installation or when updating the software. QuickBooks Error 1406 typically occurs when you are trying to install or update QuickBooks on your computer. It is an installation error related to insufficient permissions for certain registry keys. When this error occurs, you will likely see a message indicating that QuickBooks couldn’t write to a specific registry key.