WF_NOTIFICATIONS-> mail_satus is NULL and Status-> CLOSED but email is not Sent , Can you please let

 Hi

   We have PO approved Notification, where WF_NOTIFICATIONS table -> mail_satus is NULL 

and Status-> CLOSED but email is not Sent , Can you please let me know, where I need to define email ?

I looked fnd_user-> email is there in the System Admintstartor Resp. but when I ran it's not bringing email,

Can you please let me know with Navigation, where I need to change or add ?

SQL>  SELECT email_address, 

  2          nvl(WF_PREF.get_pref(name, 'MAILTYPE'),notification_preference) 

  3          FROM wf_roles 

  4         WHERE name = 'TKERBER';

EMAIL_ADDRESS

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NVL(WF_PREF.GET_PREF(NAME,'MAILTYPE'),NOTIFICATION_PREFERENCE)