Is this just a LabVIEW VI set up as a step in TestStand? If so did you wire up the controls and indicators to the connector pane in the upper right hand corner of the LabVIEW vi? (hint right click the icon and select show connector pane)
Is this a LabVIEW implimentation of a TestStand Operator Interface? If so look at the examples in TestStand folder for Simple LabVIEW Operator Interface.
Now Using LabVIEW 2019SP1 and TestStand 2019