Domoticz

I purchased Lidl wallplugs, after a while I got this error with a few: Error sending switch command, check device/hardware

I tried to solve it by removing the devices (switch, Current, Kwh, etc) and have "MQTT Auto Discovery Client Gateway with LAN interface" recreate the devices again. This works except for the most important one: the on/off switch itself.

Does somebody recongise this and how do I solve it?

Is there a config topic in mqtt for a on/off switch? What does the the log file say?
Did you also remove the old config topics in mqtt as these are normally retained?