Hi Smanar,
Just to prevent for misunderstandings, allow me to explain my steps:
First I took a brand new SD card and put Raspberry Pi OS on it, with VNC on.
Then, I changes timezone to Europe/Amsterdam, gave it a fixed IP address.
Then I followed the https://phoscon.de/en/conbee/install#raspbian. At that moment only deCONZ was active.
Using the webinterface, on https:///pwa I could not pair any device at all.
Then you gave me the alternative and that worked, but I cannot keep that screen open, so I closed it.
I did the sudo systemctl enable deconz again, but no pairing was possible.
Then I put Domoticz on the SD, via the easy was.
After that I added the plugin, following https://github.com/Smanar/Domoticz-deCONZ.
The device I previously paired, appeard in Domoticz, but the can not be handled.
It is also nog possible anymore to pair new devices.