Thanks for the quick reply and help, very much appreciated! I wanted to make sure that we internally have a thorough look at it and exclude all other problem. I found Empty Admin page when the hub is behind nginx proxy · Issue #3737 · jupyterhub/jupyterhub · GitHub and CORS issues behind nginx ingress after updating to JupyterHub 2.1.1 - #3 by ktaletsk which seem to fit my problem very well. I am trying to follow the discussions there now and will report back when I have new insights.
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