Hi,
the Strength meter does not works because the password layout is overwritten by the template that does not load the correct file
the password layout (/layouts/joomla/form/field/password.php) from Joomla load the javascript at line 49 with this code:
JHtml::_('script', 'system/passwordstrength.js', array('version' => 'auto', 'relative' => true, 'framework' => true));
instead the template at file /templates/your-template-folder/html/layouts/joomla/form/field/password.php load at line 16 this code:
JHtml::_('script', 'system/fields/passwordstrength.min.js', array('version' => 'auto', 'relative' => true));
but the file system/fields/passwordstrength.min.js does not exists, so the path seems not correct (correct is system/passwordstrength.min.js)