3623333 - Error for rehired user who was inititated from RCM - Onboarding

While rehiring the user from Recruiting receiving following error: "User ID can't be created because it's in use."

SAP SuccessFactors Onboarding

1. Go to recruiting.
2. Rehire the candidate in the system.
3. Error appears while initiate onboarding: 'User ID can't be created because it's in use."

Person - ID - external is mapped from Recruiting.

• RCM should not be passing the person-id-external. By design person-id-external will default to USERID.
• If there is a set up rule to generate this ID as part of Onboarding then IDs will match.
• In case of rehire candidates, a temporary USERID is created until the rehire match is verified, upon time, the previous USERID will be used. 
• In case there is a third-party tool used to generate person-id-external then it should be included as part of the Onboarding process, and NOT passed from Recruiting.
• It is recommended not to map person-id-external from recruiting.

OBX, Onboarding, rehire, person id, external, recruiting, User ID, created , KBA , LOD-SF-OBX , Onboarding 2.0 , Problem