So as I understand it (and as I got it to work after a couple of hours of tentatives) :
- the light can and should be already paired with the switch. I had it off both at software level via app, and powered off via electric switch before continuing.
- click 4 times the button, then wait 10 seconds even though it seems ready and pulsating much earlier.
- this is the tricky bit: press and hold the button while close to the bridge, if the red led goes immediately off, that’s not right, so you should do step 2 again. If the led keeps pulsating, press touchlink on the app within like 1 second, wait for the led to go off, then wait a few more seconds for it to start pulsating again, and only then you can release.
If this went right now both light and button are on the bridge.
- turn on power to your light, but have it off via the app.
- press and hold the button while close to the light until the light flashes, then stops flashing, then your button led pulsates red, only then you may release the button.
Now the light should work both via app and via button, or at least so does mine.
My setup:
Hue ambiance lightbulb
Ikea Rodret button / dimmer (using the word button to avoid confusion with the hardware switch that cuts electric power to the bulb)