QuickBooks Desktop can (and should) be accessed through Third Party Applications.
However, there are cases when QuickBooks Desktop cannot be accessed using or through a third party application.
This specific error occurs when you are opening and accessing QuickBooks through any Third Party Application that you are subscribed to.
The prompt or the window "Allow this application to access QuickBooks" does not appear on the screen and the
subscribed applications do not show up in the Integrated Applications menu.
Steps to follow: