Integration from Microsoft Dynamics 365/CRM to QuickBooks Invoice/Sales Order is invoked if the Generate object field in Microsoft Dynamics 365/CRM Invoice/Sales Order is selected as Invoice/Sales Order respectively.
It is mandatory that Microsoft Dynamics 365/CRM Invoice/Sales Order (to be integrated with QuickBooks Invoice/Sales Order) is associated with the respective Microsoft Dynamics 365/CRM Account. It must also have Products with Price List attached to it for DBSync to invoke integration.