I have also been struggling to find this file on my Synology.

Here is where you (or at least I) can find the xml file:

/volume1/@appstore/domoticz/var

@barbaar have you set parameter 41. Scene activation functionality: to functionality activated ? not sure if this causes your problem, but worth to try... Mischa Mischa you are my hero. After setting the 'Scene activation functionality' to 'Functionality Activated' (which for the FGD-212 is ...

Yes I understood that already.

But when I look in the activity log there are no actions registred when pushing the button. Only showing 1 on action for each domoticz restart but no actions from pushing the switch.

I have the FGD-212 dimmer from Fibaro but am unable to get the 2nd switch to work.

There is not any device that shows a status change in the device list when the 2nd switch is activated.

Do I need to set any specific setting in the Z-Wave configuration to get this to work?