May be you can try opening MAPDL directly (without Workbench) and read this file. I am wondering if the format for the nodes/element definition is somehow incorrect. You can open MAPDL from Start> ANSYS23.1>Mechanical APDL Product launcher. Then within MAPDL GUI you can use File> Read input from... and read the file. There is also an output window (in addition to the GUI) where you can see the responses to the commands. And if there is some issue with the format you should see that error pop up on the screen as well as show in the output window.
You are navigating away from the AIS Discovery experience