Solution
DAQExpress must be using
compatible hardware and a compatible version of NI-DAQmx for it to communicate with NI hardware.
You can check the
Readme for NI-DAQmx to verify it's compatibility with DAQExpress. For example, by checking the
View Readme for the NI-DAQmx version 19.6, you can determine the supported version of DAQExpress software under Application Software Support :