Cellular IoT Fundamentals, Lesson 4, Exercise 1, MQTT LED1 ON/OFF not working

Hi ,

I am running "Cellular IoT Fundamentals".
In Lesson 4, Exercise 1, has MQTT communication.
Everything went well up to the point where I have to PUBLISH from MQTT Explorer LED1ON and LED1OFF
I have no response on nRF9160 DK LED1 (LED2 is on which means connection is OK)
Pressing the Button 1 nRF9160 DK publishes the message to MQTT server as seen from images

What am I doing wrong?

Thanks

Vasilis

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