\DocumentMetadata{testphase = {phase-III,math}}
\documentclass{article}

\usepackage[T1]{fontenc} % encoding
\renewcommand{\familydefault}{\sfdefault} % sans-serif font

\usepackage[french]{babel} % langages
\frenchsetup{SmallCapsFigTabCaptions=false}

% Add \extra info to title
\makeatletter
\providecommand{\extra}[1]{
  \apptocmd{\@author}{
    \end{tabular}
    \par\vspace*{0.7em}
    \begin{tabular}[t]{c}
    #1}{}{}
}
\makeatother

% \usepackage[ % change page dimensions
%   a4paper,
%   left=20mm,
%   top=20mm,
% ]{geometry}

% \usepackage{minted} % code integration
% \usemintedstyle{emacs}

\newcommand{\mytitle}{TITLE}
\newcommand{\myauthor}{YOU}
\newcommand{\mysubject}{SUBJECT}
\newcommand{\mylocation}{LOCATION}
\newcommand{\mymail}{mailto:place@holder.com}

\usepackage[
  pdfauthor={\myauthor},   % author  metadata
  pdftitle={\mytitle},     % title   metadata
  pdfsubject={\mysubject}, % subject metadata
  hidelinks,               % clickable links in table of contents
]{hyperref}

\title{\mytitle}
\author{\href{\mymail}{\myauthor}}
\extra{\mysubject~$\cdot$ \mylocation}
\date{}

\begin{document}
\maketitle
\flushbottom
\tableofcontents
\clearpage

\section{SECTION}
Hello, world!

\end{document}