Wago 750-8215 Netvar problems


We are running Node-red, 1.0.6, as a Docker container on a Wago 750-8215 PLC.
What we want to do is use Netvars to exchange values between the PLC program and Node-red.
I followed this tutorial for setting things up: https://www.youtube.com/watch?v=NNqeP3N1j7E
At first I tried exactly as in the video but that gave problems with using the same port for both send and receive. Now I try seperate ports for send and receive.

From PLC to Node-red works perfectly.
But I cannot get the communication from Node-red to the PLC to work.

Any hint as to what I need to look at is most Welcome

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