Custom Message Update Email Notification is not working Expected

Summary:

I have created a Custom Message Update Email Notification by creating a trigger and using the Groovy Script, When the Employee will reply on to the Service request through an email which employee has received after raising an SR , then Agent should get the Email Notification as Message has been updated.

Groovy Script :

def helpdeskSR = HRHelpDeskRequest

def stripeCd = helpdeskSR?.StripeCd;

def srId = helpdeskSR?.SrId;

def parentSR = HRHelpDeskRequest

if(stripeCd == "ORA_SVC_HRHD")

{

if (MessageTypeCd=='ORA_SVC_CUSTOMER_ENTRY')
{
try

{
def messageText = """
FYI: Your Help Desk Request has been updated

"""+ MessageContent +"""

Please review the people service request within Oracle HCM to view any updates.