3645014 - IPS job to SAC fails with: "User information and username cannot be empty"

IPS job provision users from SF to SAC, it fails with the following error: 

error=HTTP operation failed invoking https://<host>/api/v1/scim/Users with statusCode: 400, Response: {"status":400,"message":"User information and username cannot be empty"}

Image / Data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental 

• Identity Provisioning Service (IPS)
• SuccessFactors (SF)
• SAP Analytics Cloud (SAC)

User information and username cannot be empty, Successfactors, people analytics,, ips synchronization, user mapping, perPersonUuid, personGUID, transformation logic, sac user sync, api version 2, , KBA , BC-IAM-IPS , Identity Provisioning Service (IPS) , Problem