Shelly Plus RGBW PM for tunable white LED and connected wall switch

[kaahla]

Hello together,
I am using my shelly Plus RGBW PM in the CCT mode with two connected tunable white LED stripes (2 channels: cold white and warm white). This actually works great. My problem is: I want to use my two wall switches to control the LEDs. I connected them with "I1" and "I3", but the shelly is not reacting on the wall switch at all. Can somebody tell me what to do to get my wall switches working?
thank you a lot for your help :)

[markirb]

See here for an answer:

#1566