I followed the documentation for the 1-wire configuration in the bootfile of my Raspberry pi 4.
I connected the 1-wire DS18B20 devices to the GPIO pin 4. This config with pullup resistor is working on my Domoticz platform.
I find the sensors in /sys/bus/w1/devices with their respective identifiers
there is no such thing as a stupid question. I misinterpreted the documentation and thought that the 1-wire integration was dedicated to remote systems.
So now I added the 1-wire integration and used SYSBUS as config item and voila I have all my tempsensors available.
thanks.