Issue sending verification emails on external candidate registration

Hi Experts-

On registration external candidate does not receive verification email. I am thinking this has got to do with WF-BATCH not behaving.

I  use the report. RCF_CREATE_USER. I am giving the following values and not able to proceed further. I am using an exisiting PERNR and getting a msg

'A candidate already exists for the employee number'

First name : workflow

Last name : batch

User name : wf-batch

Personnel number : existing PERNR (00000026)

Position : above PERNRs position number (65748354)

E-mail address : as maintained on wf-batch user (xxx@xxx.com)

I have checked the note: 746709

I have chedked the t.code SOST and I dont found register

I have checked the t.code slg1 and I dont found log of error.

I have he checked the t.code swu3

What is name of the workflow standard used for this process?

Appreciate your time!!

Thx in advance

Roopa Reddy