When end users click on the Service Desk Manager email notification survey link they get this error instead of the survey:
AHD05237:An internal error with surveys occurred
Service Desk Manager 17.3 and up
Service Desk Manager admin would need to install option op_authenticate_survey.
Login to SDM web interface as administrator then Administration-->Options Manager-->Request Manager and click on op_authenticate_survey option and install it.
Once this option is installed, restart SDM.