Zigbee devices greyed out in domoticz GUI Topic is solved

[Bospieper]

Hello, since reinstalling Zigbee2MQTT I have been experiencing the problem that all Zigbee devices are grayed out in the Domoticz GUI.
When I click on a device from the device list I get the error message: "error sending switch command, check device/hardware (idx=X)!"
What did I do? I removed all Zigbee devices from the device list and then reinstalled Zigbee2MQTT. I added the devices again via Frontend. These also appeared in the device list.
In Frontend I can switch devices on/off.
What I read on the internet has to do with the device ID which somehow no longer matches what is in the database.
I need some help to solve this problem.
Grtz Piet

[waltervl]

Greyed out means they are not connected to an active hardware gateway in Domoticz.
So you have to check the settings of zigbee2MQTT in Domoticz menu Setup - Hardware

[Bospieper]

I'am so stupid.I'd overlooked completely the fact that the zigbee2mqtt in the hardware was inactive. It's working now.
Thanx Waltervl