3639552 - Error appears "An error occurred while generating new user id. Please contact your system administrator" when hiring an employee

When trying to hire an employee via RCM/ONB/Add new employee page, you encounter an error which says  "An error occurred while generating new user id. Please contact your system administrator"

SAP SuccessFactors Employee Central

error, Error,"An error occurred while generating new user id. Please contact your system administrator",when hiring an employee, hire, HIRE, Hire, employee, new, manage pending hire, manage pending recruit, manage pending, RCM, ONB, submit, save, Sequence, sequence, rule, Rule, "MATCHINGUSERCONFIG", "Recruit/Rehire Configuration", "Hire/Rehire Configuration", id, ID, unique, user id, person id, userid, generate, Generate,"ECT_service_layer_HRIS_USER_GENERATION_ERROR","com.successfactors.sca.ServiceApplicationException: ECT_HRIS_EMPID_FROM_RULE_NO_UNIQUE_ID",com.successfactors.sca.ServiceApplicationException: ECT_HRIS_EMPID_FROM_RULE_NO_UNIQUE_ID ,Error during user Id generation for Person ID: null  , KBA , LOD-SF-EC-HIR , Hire & Rehire Wizards , LOD-SF-EC , Employee Central , LOD-SF-EC-INT , Manage Pending Hires (Integration RCM/ ONB/ OBX + UI) , How To