Getting "One or more valid dependent for the participant could not be found" error in Data loading

Summary:

We are trying to load Benefits Dependent Data but facing the error of "An error occurred. To review details of the error run the HCM Data Loader Error Analysis Report diagnostic test. Message details: One or more valid dependent for the participant could not be found, check all the dependents are defined as contact for the participant."

 Getting this while trying to load Dependent Enrollment DAT Here's the DAT:

METADATA|DependentEnrollment|PersonNumber|BenefitRelationship|EffectiveDate|LifeEvent|LifeEventOccuredDate MERGE|DependentEnrollment|10006|DFLT|2024/09/22|Benefits Conversion|2024/09/22

 METADATA|DesignateDependent|Plan|Program|Option|DependentPersonNumber|LineNumber|PersonNumber MERGE|DesignateDependent|CareFirst BlueChoice Advantage PPO|Henry M Jackson Health and Welfare Plan|Family|100009|1|10006 MERGE|DesignateDependent|Delta Dental - Enhanced|Henry M Jackson Health and Welfare Plan|Family|100009|3|10006 MERGE|DesignateDependent|VSP Signature|Henry M Jackson Health and Welfare Plan|Family|100009|5|10006