Someone on reddit helped me out. The answer was to install Factorio Server Manager. After that, it all worked out.

I recently set up an unRAID server and am trying to set up Factorio in a Docker container on it, but am having issues I can't seem to solve. tl;dr: the service-username and service-token get overwritten when the docker container starts. 1. Opened unRAID and went to Apps 2. Searched Factorio and inst...