Form/Field Rule not executing custom script on submit

Form/Field Rule not executing custom script on submit

Has anyone run into this? I have a custom script that I've written to set the description to a series of variables pulled from field values in the Service Catalog. The script itself works fine when I edit the request. I currently have it defined under Field and Form Rules as a "On Form Submit" with no conditions and set to execute on create/edit. When the request is submitted, the values are not populated but when I execute an edit as a technician, the description gets set with all the values.

Any ideas?
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