AMIBroker functions for order cancellation, fetching order & position details do not work.
Solution
These functions are only supported on Zerodha KITE, Upstox & AliceBlue as of now.
In order for these functions to work; you must go to menu (Settings -> AutoTradrer -> Trading): Set PLATFORM_SYNC property value to ON.
Once you have changed this setting, AutoTrader will start sending order & position details back to AMIBroker.