Thank you very much for your help, very much appreciated!
No, I was using Coolify. The trick was to add the domain indeed, just didn’t know yet how that would work, but then the idea came how to do that in Coolify and now it works. Just had to add a comma with the subdomain I wanted it on and restart the instance.
Made a small guide on it to summarize for other people stumbling into the same for future reference.