Code doesn't work on board

I connected the Wemos mega wifi r3 to the arduino iot cloud by LOLIN(WEMOS) D1 R2 & mini (esp8266 wifi module). All code flashed onto the controller doesn't effect the board (e.g. LED wont turn on). If i flash the code onto the atmega from the board it does work. The wemos mega/arduino mega is not compatible with the iot cloud tho.. Is it possible to control the pins for a LED with the esp8266 as the controller?

Sure, but I assume your actual question is a bit more complex than just controlling one LED with an ESP8266.

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