to be able to use my GPIO ports from domoticz, I use the workaround:
-I made a very basic script
gpio.sh placed in /home/pi/domoticz/scripts/
#!/bin/bash
gpio write $1 $2


then I create a virtual button
and put actions in
On action: script:///home/pi/domoticz/scripts/gpio.sh 0 0
Off action ...

Hello,

I have the same error,
Error: GPIO: Failed to detect any pins, make sure you exported them!

but I am able to see pin exported with gpio exports:
GPIO Pins exported:
12: out 0 none
17: out 0 none
18: out 0 none
22: out 0 none
23: out 0 none
24: out 0 none
25: out 0 none
27 ...