E1603/E1702 Tradfri control outlet not reacting to publication


I wanted to ask if someone could help me with a Tradfri control outlet (supported device https://www.zigbee2mqtt.io/devices/E1603_E1702.html)

My problem is that it does not react to switch messages.

It does indeed react to OTA updates, which I carried out succesfully yesterday.
The reponse for OTA update now is as follows:
{“update_available”: false, “state”: “ON”, “linkquality”: 139}

what is the correct payload to switch it off?
I tried {“state”:“OFF”}, I tried {“switch”:“OFF”} as this is listed as component in Z2MA besides linkquality and update_available, but also {“set”:“OFF”}, also without quotation marks.

still, the device won’t shut off.

Thank you