can't find how to include Request Closure Code in mail to specialist

can't find how to include Request Closure Code in mail to specialist

Hello!
can't find how to include Request Closure Code in mail to specialist - please advice
What I want to see - every time, when any request is closing, I need a mail to administrator with some info. I tried to include Request Closure Code to this mail, but can't - please help to understand how it possible to do.

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