The HCM picklist field in Onboarding panel is not populated and is blank.
The key in data dictionary is configured as picklist with Intergation Type : Code Based.
Export the picklist and check if the picklist has external code in the csv file.
This issue will cause if the external_code is empty.
Import the picklist csv file after adding the values for External_code.
KBA , LOD-SF-OBD-ADM , Admin Tools, Settings, Permissions , Problem