FrameMaker not producing Mini TOC in HTML5

Hi,

I can't get FrameMaker to generate Mini TOCs in HTML5 output.

I have a normal TOC that works fine, as well as Mini TOCs in each chapter that come out fin in PDF.

I have added the following to the HTML Template (other customizations work fine, so it is properly imported):

<!-- MiniTOC starts here-->
       
    <div data-type="minitoc" data-type-after="Body Heading_1 Heading_2">
      <p data-type="minitoc-level1"></p>
      <p data-type="minitoc-level2"></p>
    </div>
        
<!--MiniTOC ends here-->      

Yet when the HTML is generated, the Mini TOC section is empty:

    <!-- MiniTOC starts here-->

    <!--MiniTOC ends here-->   

I have tried with and without the 'data-type-after' attribute, as well as all combinations of FM styles, HTML styles, with and without quotes, etc. It just doesn't produce anything.

Does anyone have any suggestions before I give up?