Employee not found in Vacation Rules Drop down list Workflow Administrator Web(New) responsibility

Hi - Employee/user name is not coming up in drop down list on Workflow Administrator Web(New) responsibility. Under Vacation Rules for following section User name is not showing.

"Select a User whose Notification Rules to be configured."

The Employee/user record is existed and active in FND_USER and PER_ALL_PEOPLE.

I ran the "Workflow Directory Services User/Role Validation" and "Synchronize WF LOCAL tables" Still the problem is not resolved

Oracle Application version is 12.1.3

Thanks in advance.