Fibaro Dimmer 2 - S2 Switch


I have a Fibaro Dimmer 2 and I used to use the S2 (second switch) to turn on my lamps that have smart bulbs. However, over the last few days it stopped working. When going into my routines I noticed that the preconditions were empty, when I tried to add the second switch ‘on’ or ‘off’ functionality it had disappeared. I can only see the 1st switch only. Can someone help?



Is that Zigbee or Z-Wave?