Sorry I don’t really get what you mean. First three steps are clear to me and but the other two steps I cannot follow:
What do you mean with Admin workspace? As an admin user I have to access the Windmill app? Or do you mean the Windmill settings in the Admin account? Can you access the Windmill app at that point already?
I think in my case something with the NGINX config is wrong or the Docker socket proxy config (which is AFAIK derived from Tecnativas and might require some more configuration that is not described in the Nextcloud manuals).
I opened an issue in the Flow app. But currently do not really have the time to work on debugging it further.
Hints are welcome 