3623611 - Real time job failed to sync an onboardee to IAS, with Error message 409 Conflict

• Real-time sync job failed to add onboardee user to IAS.
• Error message: 

"The request to create an entity has failed with: 409 Conflict 'Login name 'XXX@XXX.com' isn't unique.' The attempt to retrieve the existing entity from the target system was unsuccessful. No resource found from https://XXX.accounts.ondemand.com/service/scim/Users?filter=userName eq "XXX@XXX.com"

SAP SuccessFactors Onboarding

real-time sync, IAS, onboardee, user authentication, login name conflict, error 409, unique identifier, user sync failure, identity authentication service, User ID, Email, Login Name, Display Name, Phone , KBA , LOD-SF-OBX-IAS , IAS User Authentication , Problem