Well, in theory it would work something like this:
<a href="https://ServerName/ProcessManager/Portal/Template66_33.aspx?PageID=EE590E15-4B65-422D-9CEB-A6B75CD9E4F9&ReportSessionID=${WorkflowTrackingID}¬abs=1&SideBar=false&SuggestNextProcessID=false">
To view your ticket, click here.</a>
However the issue now is that the rules engine isn't replacing the WorkflowTrackingID with the value, its leaving it as is so the URL points to a blank ticket page.