If your JIRA isn't public they can't and mustn't.
If they could the could see all of your issues.
When the customer has LogIn Access and Project Browse Permission theoretically could link them but if he just can login in the SD the answer is No.
As a workaround the customer could enter a customfield "request ID" and a postfunction links them in your JIRA if the ID matches an existing
...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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