Using Descriptive Flexfields in an Eligibility Profile

Summary

Need to use a segment on a DFF within an Eligibility Profile

Content

Hey all,

Hoping someone could point me in the right direction. I am trying to add a segment on the PER_ASG_DF flexfield to an eligibility profile. I am having trouble, however, adding it as a User-Defined Criteria. I've gone into Manage User-Defined Criteria and attempted to create a new UDC, but no luck finding this DFF.

I feel like I'm either misunderstanding the correct way to do this, or it can't be done via UDC and I will need to use a fast formula.