Apporvals in service catalog

Apporvals in service catalog

dears
i have problem with send approval to department heads
i configured everything in workflow of each service catalog and I'm sure from configuration
when any user open request from service catalog should be after add request , approval email go to department head
but this not happen , i want know whats problem ? & how i i can solve it ?

note: in workflow i selected  my manager and department heads and approval email go to my manager only

thanks








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