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Hello,

Maybe you didn't set the correct heading levels that must appear in the TOC? On this page you can find more information about TOCs:

https://www.phpdocx.com/documentation/cookbook/tables-of-contents

This is a simple script that generate a DOCX from scratch adding a TOC and two headings (note the displayLevels option):

<?php

require_once 'classes/CreateDocx.inc';

$docx = new CreateDocx();

$docx->addText('Table of Contents', array('bold' => true, 'fontSize' => 14));
$legend = array(
    'text' => 'Click here to update the TOC', 
    'color' => 'B70000', 
    'bold' => true, 
    'fontSize' => 12
);
$docx->addTableContents(array('autoUpdate' => true, 'displayLevels' => '1-3'), $legend);

$html = '<h1>Heading 1</h1>';

$html .= '<p>Other text</p>';

$html .= '<h2>Heading 2</h2>';

$docx->embedHTML($html);

$docx->createDocx('output');

If you open the DOCX with MS Word or LibreOffice and then update the TOC, both heading appear in the TOC.

Regards.