Thanks, that’s the missing piece. Ironically I am a software engineer in my day job, but not the right kind of software engineer. It’s fun to broaden my horizons though. I copied the proxy settings from the @jax@lemmy.cloudhub.social’s nginx.conf with the right edits for the hostname into my reverse proxy config and now everything appears to be working!
I wish they didn’t throw “think of the children” in there.