Loading Participant Enrollment for "New Hires"

Summary

Getting an error in HDL - Participant Enrollment upload. Error: "The value for benefits relationship name is either null or invalid. Enter a valid benefits relationship name."

Content

We are using the Participant Enrollment Business Object to derive our file.  The new hire has a "New Hire" life event that has been evaluated and is effective 12/6/2020.  There are also two Benefits Relationships effective 12/6/2020 for this team member (who's name is CWS Benefits) - DFLT and UNRST.  I have tried both in the BenefitRelationship column and get the error both ways. 

METADATA|ParticipantEnrollment|PersonId|PersonNumber|ParticipantLastName|ParticipantFirstName|BenefitRelationship|LifeEvent|LifeEventOccuredDate|CloseLifeEvent|CloseLifeEventDate|EffectiveDate|LegalEmployer