Language Server Never Started

I'm trying to use this extension for modding Hearts of Iron 4, but I never get language server hits. It seems like it's not started. I've tried looking into any messages that it might have sent it "View -> Output", but it doesn't even come up in the drop-down menu.

I've tried opening VS Code directly in the game folder, in my mod folder and in Documents/Paradox Interactive/Hearts of Iron IV/mod folder folder