Agent not getting email notification when a ticket is assigned- Only getting bell notification

Hi, We have triggers in place for an agent to get bell notification whenever the ticket is assigned to them. And in BPM Worklist our Notification is set to 'ALL'. So, should this bell notification not generate an email as well?

Our trigger is:

if (isAttributeChanged("AssigneeResourceId"))

{

try

{

def recipientPartyId = AssigneeResourceId

def messageText = "Help Desk Service Request #" +SrNumber+ " has been assigned to you."

if(recipientPartyId)

{

def map =new HashMap()

map.put("Channels", ["ORA_SVC_BELL"])

map.put("MessageText", messageText)

map.put("RecipientPartyId", recipientPartyId);

adf.util.sendNotification(adf,map)

}

}

catch (e)

{

throw new oracle.jbo.ValidationException('Failure:'+e.getMessage())

}

}