Variable injection and any liquid syntax not working in Customize Login Page

I follow this documentation to customize my login page :

However, liquid injection {%- auth0:head -%} and variable injection is not working (I put a preview screenshot, it’s the the published page).

Tested in classic and in new universal login experience.

Any idea?

Got answer from auth0 support.

The UI to customize login page is not using templating.

You need to use the Management API. This is the only way.