Unable for MCP to communicate with iFly B737NG in Prepare3D v5

All numbers displayed on MCP are zero and don’t change if knobs are rotated and MCP display values don’t change. Conversely, if I change MCP values on P3D display they don’t communicate to the MCP hardware display. I am overlooking something in the installation?
Running Cockpit SImulator v2023.1.3 shows the following:
Simulator Platform: Prepar 3D v5.3.17.28160
Simulator Aircraft; iFLy 737NG
Connected Devices: CS737X MCP Firmware v1.0.1
Running the tests from Cockpit simulator work fine

Currently only CDU supports IFLY, and support for MCP and EFIS is under development and testing.