Check your BIOS settings and be certain all USB ports are enabled. If you can get a Linux shell prompt, use the command lsusb to see USB devices recognized by the system.
I tested all USB ports with the Conbee II and it always worked.
How do I get a Linux command in HA?
I also try the same USB port where the Conbee II is connected, but nothing happen with the Sonoff
As @nickrout says, the your output shows device is being seen by HAOS.
How are you expecting HA to display it as “found?” If ZHA is already set up and configured it may not auto detect a second stick (even if the “old” stick is disconnected).
What devices display from Integrations->ZHA->Migrate Radio->(Submit)->Reconfigure the current radio:
Alternatively, what happens if you delete the ZHA integration first?
on the internet i saw how (raspberry pi) users connected 2 sticks. And so transfer the radio from one to the other. Something I also wanted from the Conbee II to the Sonoff.
I did indeed remove all ZigBee devices first and finally the Conbee II. After this, the Sonoff was recognized immediately.
The reason I wanted to replace the Conbee II was because it does not indicate LQI and RSSI on the stick itself, both have the status: Unknown. But all Aqara devices also have no status.
After installing the Sonoff I still have the status
LQI and RSSI: Unknown on the Sonoff stick.
LQI and RSSI are enabled on all Aqara devices and I only have LQI information.
What is your experience with Conbee II and Sonoff?
True, but I saw others on the Internet.
But with both the Sonoff and the ConBee II I do not see this RSSI information with all connected Zigbee devices.No devices show the RSSI
Do you now how I can fix that?
I haven’t used ZHA sorry, perhaps start a new thread as this one was about not finding the co-ordinator, a problem which you seem to have fixed. (I see LQI on zigbee2mqtt if that is any use)