The second wago connects the neutral wires (there are not a green-yellow wago).
But I see a Wago with green/yellow wires in this picture:
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I called this junction box “box B”. And in this junction box should be a wire with permanent live potential.
Whereas this junction box
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is called “box A”. This is the junction box where you’ve installed the Shelly 1, right? And the brown wire in terminal “IN” of the switch has permanent live potential, isn’t it?
Next task for you: Find out, where the brown wire in box A (single wire in Wago) ends! Is it to find in box B? Please find an Tag this wire in box B - we need it later!