How to highlight a section, subsection... with text in italic

Question

I know that you can highlight text inside a section like this : \section{\hl{text}}. But in my case, I have text in italic inside my section, and it won't work.

Here's the code I tried : \subsubsection*{\hl{Author, \textit{Book} (date)}}. enter code here

Any idea?

Here's my entire code :

% Template
%Format
\documentclass[10pt]{report}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[a4paper,portrait,hmargin=1.5cm,vmargin={2.5cm,2.1cm},headheight=12.5pt]{geometry}
\usepackage[french]{babel}
%Chapitres, sections...
\renewcommand{\chaptername}{Chapitre}
\renewcommand{\partname}{Partie}
\renewcommand{\thesection}{\Roman{section}} % \arabic{} ou \Alph{} ou \Roman{}
\renewcommand{\thesubsection}{\Alph{subsection}}
\begin{document}
\part{Europe}
\part{Latine America}
\section{Identity and Culture}
\subsubsection{Author, \textit{Book's title} (1981)} %this one works
\subsection{\hl{author, \textit{Book's title} (1981)}} %this one won't
some text
\end{document}

Answer 1

\documentclass[10pt]{report}

\usepackage{soul}   % <------- Added: https://tex.stackexchange.com/a/114909/273733
\usepackage{xcolor} % <------- Added
\usepackage[colorlinks=true,breaklinks=false,linkcolor=black,urlcolor=black,pdfauthor={Me}]{hyperref}
%\usepackage{hyperref}

\title{\textbf{\Huge{Authors}}}
\date{2022}
\author{Me}

\begin{document}
\part{Europe}
\part{Latine America}
\chapter{Testing}
\section{Identity and Culture}
\subsubsection*{\hl{Author, \textit{Book's title} (1981)}}
some text
\end{document}

As an aside, your code in the question could not compile (as I mentioned in the comments) and was too long, for example, the packages needed to use \hl were not present.

You are loading hyperref twice which can cause issues, hyperref should be loaded only once and last (except for packages such as cleveref, glossaries etc). Hopefully this does as you seek.