Roundcube ISPconfig plugin

I can't seem to get the plugin for ISPconfig to work with Roundcube on a new Debian 9 perfect server (Apache).
I have tried these settings in config. (These worked in Debian 8).

Code:

// List of active plugins (in plugins/ directory)
$config['plugins'] = array(
        'archive',
        'emoticons',
        'zipdownload',
        'jqueryui',
        'ispconfig3_account',
        'ispconfig3_autoreply',
        'ispconfig3_autoselect',
        'ispconfig3_pass',
        'ispconfig3_spam',
        'ispconfig3_fetchmail',
        'ispconfig3_filter',
        'ispconfig3_forward',
        'ispconfig3_wblist',
        'markasjunk'
);

 

Silly me.
I forgot the symlinks in /var/lib/roundcube/plugins/