Hi, I do not know what else to do. Original installation from an electrican. I thought to remove old switch and replace as I saw the neutral all connected together. I tried all combinaison I could with the wire with no success

Setup that should be good but did not work

using the white and black wire from the old switch to black wires from the HS200

Green connected to groud

White connected to the white neutral bundle

Thanks for your feedback and help!

Math