Unexpacted Token in SendGrid Code

A minor fix (not tested though):

 	let newsletter = `\rRecevoir Newsletter: `;
	if ($w("#NewsletterCheckbox").checked) {
		newsletter = newsletter + "Oui";
	}  

 	let confidentielles = `\rDonnées Confidentielles: `;
	if ($w("#ConfidentielleCheckbox").checked) {
		confidentielles = confidentielles + "Oui";
	} // <== notice where this bracket is
	
	const body = `
    	\nNom: ${$w("#Nom").value}
    	\nPrénom: ${$w("#Prenom").value}
    	\nTéléphone: ${$w("#Telephone").value}
    	\nEmail: ${$w("#Email").value}
    	\nMessage: ${$w("#Message").value}
    	\n${intrests}
    	\n${newsletter}
    	\n${confidentielles}`;

Notice that I moved the bracket that was the last line of your code in your previous post.