I've got a rule that fires properly and sends an email after a comment is saved. I want to theme this specific rule using the documented method.
My template name: mimemail-message--rules--ticketcomments.html.twig
I created a mail system module with the same "key" name.
Theming to the mimemail-message--rules.html.twig
does work.
What am I missing?
mimemail-message--[module]--[key].html.twig
\Drupal::logger('my_module')->error($message['key']);
and check the Drupal log.