Please make sure to install the driver in Windows 10 Iot Core using the appropriate devcon commands, and restart the device after installing the driver.
Whether the driver is successfully installed can also be verified from the normal operation of the corresponding hardware device.
Usually the devcon.exe utility can be used to install driver on a device with Windows 10 Iot Core installed.
The device console utility is useful in identifying and managing installed devices and drivers.
In addition you can add the driver to the Iot Core image and rebuild the FFU image.