SSO credentials not used in IssueViewURLHandler

A customer has created a SSO plugin and are facing some specific issues in this context. When they click on the printable link of an issue i.e: http://jira/lodh/si/jira.issueviews:issue-html/ORGJIRA-13/ORGJIRA-13.html they get an error page indicating "the user myuser... doesn't exist..." They...