Solution
Exporting the NI-MAX configuration is not supported by the PXIe-408X family. The system API has not been implemented to export or import data from NI-MAX for these devices.
As a workaround to bring an alias into an NI MAX configuration, it is possible to use the "
Rename Aliases" example found in LabVIEW Help by adding the "nidmm408x" expert: