It WORKS thank you ! … IKEA BILRESA - Matter, using Sonoff dongle
BUT I found the instruction contusing, you mention “helper” but I understood as a “variable” to store data - called as “helper” in HA → Settings → Devices & scenes → Helpers
The screen shots made even more confusing, made me though you was in “Create New Helper” screen, but you was in fact creating a script,
My kind suggestion I think would be better to remove the screenshot, rename light_color_hs_helper to something that does not use the word ‘helper’, add the steps in the message above in the main post.
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Sharing options that worked for me for
IKEA Bilresa Scrollwheel (Matter) – Ultimate Light Controller (Atomic Edition)