Problem with innogy / livisi binding "CONFIGURATION_ERROR ... Please set auth-code!"


I’m using Openhab 3 via docker image. I struggle to get the innogy binding to work. I tried the latest stable and the Milestone release 3.2.0 M2 to no avail.

It says:

Cannot connect to innogy SmartHome service. Please set auth-code!

I double checked the code and I have used different generated codes.

Using ubuntu 20.04.3 LTS, 5.11.0-37-generic. docker Version 20.10.8 (API: 1.41)
I have been trying Openhab 3.1.0 and 3.2.0 M2/M1

PS: My hue binding in this openhab instance and seemingly everything else works.

Do you have any thoughts on what might be the problem?