Tried the URL with the user_code again today. Same error appeared.
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Looking into Settings/hardware/Tado. There a saw a knob, orange with the text 'Aanpassen'(Adapt). After using that new option it disappeared and next text appeared in the Status log:
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After this message the URL ...

Hi Gizmocuz, thanks!
I haven't tried Zigbee yet, so I'll have a look at it.
Same for the Hue software in Domoticz, haven't look at this at all yet.
Is there any guidance or documentation on this to start on that?
thks,
Andre

Hi All, Since 2023 Philips Hue brought Contact Sensors to the market.
Being fed up for years with multiple RF based sensors 434/868Mhz ranges of different brands I tried, I bought myself recently 2 Philips Hue Contact Sensors. The sesnsors work fine in Hue App, except that don't show up in Domoticz ...