you can either send directly within the flow using send email or call the notification using send notification ( here you would create the notifications on the notification table)
if you need to specifically do it in flow designer, you can add a 'wait for condition' activity and have it wait for RITM state "closed complete" - then following this activity, add your notification.
or you could just set up an email notification for table sc_req_item and have it trigger on state = closed complete (and any other filters you might want, e.g. item = (specific catalog item))
please mark as answer / helpful if i have answered your question.
