My mathjax doesn't render

I am trying to make my first blog post, but LaTeX doesn’t render.

I am using obsidian for WYSIWYG editor and there things render correctly.

I changed $$ … $$ to \[ …\] and $ … $ to \( … \) (I needed a plugin for obsidain)

mathJax is enabled.

I could change things in config.ini as I selfhost single user instance.

I can’t seem to edit the post:
version: WriteFreely 0.17.2