Youtrack Zendesk Integration - Internal Notes Follow

 Hi,

I've successfully integrated Zendesk into Youtrack but cannot seem to figure out how to add a comment as an Internal Note. I've tried setting the comment visibility to only my user but I get the following error:

'You can't set permitted group to issue comment because of license restrictions.'

I'm not sure if this is a restriction of my Youtrack license or Zendesk. Can anyone shed any light?

Thanks,

Gary