How to export inline quotations from emacs org mode to latex csquotes syntax?

I would like to export inline quotations in an org-document to \enquote{} commands. The csquotes package then ensures French quotation marks « » are used in the resulting pdf document.

I am well aware this question has been asked before here - and that solutions have been suggested by @Jonathan Leech-Pepin and @Christophe Poile. I tried all solutions suggested, without success. I would like to avoid (1) hardcoding the correct quotation marks or (2) using the latex command in my org document. OSX 10.15.5, emacs 26.2, org 9.2.5.

Org document header:

#+Title: GS
#+AUTHOR: HDV
#+SEQ_TODO: 
#+TAGS: 
#+STARTUP: indent
#+LANGUAGE: fr
#+LaTeX_CLASS: article
#+LATEX_CLASS_OPTIONS: [a4paper,11pt,twoside]
#+LATEX_HEADER: \usepackage[utf8]{inputenc}
#+LATEX_HEADER: \usepackage{ae,lmodern}
#+LATEX_HEADER: \usepackage[french]{babel}
#+LATEX_HEADER: \usepackage[T1]{fontenc}
#+LATEX_HEADER: \usepackage{graphicx} 
#+LATEX_HEADER: \usepackage[babel=true]{csquotes} 



Exported latex preamble:

    % Created 2020-07-07 Tue 20:45
% Intended LaTeX compiler: pdflatex
\documentclass[a4paper,11pt,twoside]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{graphicx}
\usepackage{grffile}
\usepackage{longtable}
\usepackage{wrapfig}
\usepackage{rotating}
\usepackage[normalem]{ulem}
\usepackage{amsmath}
\usepackage{textcomp}
\usepackage{amssymb}
\usepackage{capt-of}
\usepackage{hyperref}
\usepackage[utf8]{inputenc}
\usepackage{ae,lmodern}
\usepackage[french]{babel}
\usepackage[T1]{fontenc}
\usepackage{graphicx} 
\usepackage[babel=true]{csquotes} 
\author{}
\date{\today}
\title{}
\hypersetup{
 pdfauthor={},
 pdftitle={},
 pdfkeywords={},
 pdfsubject={},
 pdfcreator={Emacs 26.2 (Org mode 9.2.5)}, 
 pdflang={French}}
\begin{document}