Issue creating a OPC-UA Client subscription in Docker

[Aapok]

Hey!

I have a setup running a opcua-asyncio client code in a docker container. This client connects and
reads/writes from/to prosys simulation server and everything else is working except subscribing to nodes on the server.
Subscribing to nodes gives the following error in the servers log "Bad_NoSubscription (0x80790000) "There is no subscription available for this session.""

The exact same code works from outside the docker container run with the same python and opcua-asyncio versions.

full request and response from server to opcua client

The code used is the same as here https://github.com/FreeOpcUa/opcua-asyncio/blob/master/examples/client-subscription.py
just changing the endpoints and nodeID

Python:3.7
opcua-asyncio:0.9.0
docker: 2.3.0.3