you may not configure such alert email before for duplication detection jobs, I guess.
When I clicked the url link, it did not open any page in browser - the server name is wrong: unlikely MS names some as test* - must be a bug, if not a configuration issue.
It also means nobody is using that feature!
Log on to Microsoft Dynamics CRM and navigate to System Tasks page and double-click the name of the task. - this does work though.