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Why does Swift Mailer not use my HTML template?

In some form of my custom module, a condition triggers an email to be sent: 

  public function save(array $form, FormStateInterface $form_state) {     $entity = $this->entity;     $status = parent::save($form, $form_state);     $values=$form_state->getValues();     if (($values['isurgent']['value']==1) && ($values['status']['value']==1)) {       $iSeliste = Drupal::currentUser()->id();       $oSeliste = Drupal::entityTypeManager()->getStorage('person')->load($iSeliste);       $sSelite = $oSeliste->firstname->value . " " . $oSeliste->lastname->value;       $sAction = ($values['action'][0]['value']==0)?"offre":"demande";       $sDueDate = $values['duedate'][0]['value']->format("d/m/Y");       _sendEmailForUrgentService($sSelite, $sAction, $sDueDate);     }

in sel.module: 

function _sendEmailForUrgentService($sSeliste, $sAction, $sDueDate) { ...some code...   Drupal::service('plugin.manager.mail')->mail('sel', 'emailforurgentservice', $sTo, 'fr',      $params);   Drupal::logger('sel')->info('Courriel pour service urgent : envoi effectué.'); }

my hook_mail: 

function sel_mail($key, &$message, $params) {   $sFrom = '[redacted]';   $message['from'] = $sFrom;   $message['headers'] = array(     'Content-Type' => 'text/html',     'bcc' => $params[3],     'From' => $sFrom,     'Sender' => $sFrom,     'Return-Path' => $sFrom,   );   switch ($key) {     case 'emailforurgentservice':       $message['subject'] = '[Le Grenier à SÉL] Un service urgent requiert votre attention...';       $sBody  = $params[0] . " a posté une " . $params[1] . " urgente qui est valide jusqu'au " . $params[2] . ".";       $message['body'][] = check_markup(nl2br($sBody), 'full_html');       break;   } }

The settings of mailsystem are these:
enter image description here

And in my theme templates folder (mysite/web/themes/contrib/mayo/templates/), there is my email template swiftmailer--sel--emailforurgentservice.html.twig: 

<html> <head>     <style type="text/css">     table tr td {           font-family: Candara;           font-size: 14px;         }     </style> </head> <body> <div>     <table width="800px" cellpadding="0" cellspacing="0">         <tr>             <td>             <div style="padding: 0px 0px 0px 0px;">                 <p>                     Chers S&Eacute;Listes,<br><br>                     {{ body }} <br>                     Vous pouvez la consulter <a href="http://lejardindepoissy.org/?q=sel_catalogue">ici</a>.";<br>                     Si vous ne la trouvez pas, c'est peut-être qu'elle a d&eacute;j&agrave; &eacute;t&eacute; satisfaite.";<br><br>                     --<br>                     Le Grenier à S&Eacute;L                 </p>             </div>             </td>         </tr>     </table> </div> </body> </html>

The email is sent. Everything is OK (From, To, Bcc, Subject) except the body!
Instead what I defined in the template, I have only the content of $sBody as defined in function sel_mail().
Any idea what I am doing wrong? 

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Why does Swift Mailer not use my HTML template?

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