For users who prefer to manage the entire communication process with their resources, we offer a private backend solution (internal network web application). This backend runs within the user's environment and enables communication between the Power BI service and the database of their choice.
Typically, this means that the Power BI user must be connected to the domain network to perform writeback operations.
This does not affect the user reading the Power BI reports while not using VPN (only writeback is disabled).