There are different requirements for the DLL version of the EA (MT4 and MT5) versus the no-DLL version (MT5 only).
MT4 version, and MT5 DLL version:You need to turn on "Allow DLL imports" in the Settings window:
- MT4: the option is on the Common tab of the Settings window
- MT5: the option is on the Dependencies tab of the Settings window
MT5 no-DLL version:
You need to allow the EA to contact the trading hub, using the WebRequest list in Tools / Options / Expert Advisors.
When you add the EA to a chart, it will display the setting which you need to add to the WebRequest list:
You need to add this setting to the WebRequest list in Tools / Options / Expert Advisors: