Maybe I can help you. In an other topic I found this solution:
TCA Quadrant & AddOn problem with SU5 - Bugs & Issues / Hardware - Microsoft Flight Simulator Forums
In the settings of my TCA Quadrant I removed the entry “Toggle Engine 1 Fuel Valve”, now I can start, run and shut down the engine No 1 of the A32nx (Developer) via the TCA Quadrant.
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