That is unfortunately not possible right now, because users that can login into Service Desk are all users in JIRA. That is why Atlassian currently promotes this tool as a way to provide internal support in your company, although I believe it has much more potential...
Hope this answers your question?!
...be more productive while being fun to use at the same time. For some, getting started can be a bit intimidating. This is especially true if Jira Service Desk is your first exposure to Atlassian...
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