if the new Dell USBC to ethernet dongle has PXE boot capability but it’s not working because the WinPE cannot connect to the bare metal server once loaded, you have to bind its driver to WinPE 10 x64 image.
As first you have to import the driver in the Driver Library tab of the Driver Library dashboard.
Then you can generate the binding grid of your target computer model with the image “WinPE 10 x64” in the Bindings tab of the Driver Library dashboard.
The dongle device is probably not listed in the PCI devices inventory of your computer model (because it should not be a PCI device) so, to bind its driver to the specific binding grid, you have to manually bind it, clicking on the button “Add driver” and selecting it the list.
After that you save your changes and that the automatically launched sync action has been completed on the bare metal server, you can retry the PXE boot and this time the driver will be injected into the WinPE before trying the connection to the bare metal server.