Hello Jerome,
Thanks for clarify it!
Could you confirm if both should have the same state(high or low) when using gpio.sh get in CLI. Because I have the setup as your diagram. However, I cant change the state of LED, depending on the setup if LED positive is connected to either NC or NO, then it will always keeps active or inactive even if changing DOUT state.
Fyi, my name convention of IO is as following:
Relay:
A1 = positive, dc power supply
A2 = negative, dc power supply
COM = Power supply
either NC/NO = postive, LED
GND = negative, dc power supply.
Anyway, I wish you merry christimas :)