Make sure the thermostat is operational and connected to the Cloud using the App.
Nexia/American Standard/Trane can be auto-discovered by the Magic Cube running Magic Cube.
If an instance was found, it will be shown as “Discovered”, which you can select to set it up right away.
Go the Settings, Devices & Integrations and browse over to Nexia integration. You should be able to control the Tstat from the HA interface.
You can now proceed with installation of Magic Cube Climate Pro Driver. From the drop down menu select Platform: Trane / Nexia / American Standard, click Apply then Install.