I’m confused about all the threads, there’s this, and also this:
But I see no symptoms in either topic that in what way CODE isn’t working, or isn’t accessible from Nextcloud.
The admin console isn’t particularly necessary to get it to work. However, the reverse proxy config seems incomplete, if you have one, and the CODE server isn’t accessible from outside, you should set up something similar to what’s described here: Proxy settings — SDK https://sdk.collaboraonline.com/ documentation