TargetData not defined - value coming from an enrichment

Hello,

I am creating an enrichment to pull in first name from a separate table that will be used in an email.  The field is defined below in Adobe, but when I code the targetData to reference that field, I am getting the error the targetData is not defined.  The way the enrichment is set up it looks like its not actually part of the target data but is a subset of it.  I am wondering if the "/" is causing the issue.

Enrichment:

Field:

TargetData reference: 

<%= targetData.onboarding/firstname %>,

Any help is appreciated! thank you