Symptom
When you create an employee using SAP standard webservice II_EMPLOYEE_REPL_IN and no identityID tag is passed, the User ID is created with the EmployeeID + Last name.
Environment
SAP Cloud For Customer
Cause
The existing behavior is the designed system behavior.
The logic of creating an User ID with the EmployeeID + Last name is standard.
In case no identity tag is passed and is in place for years, this is the same behavior if you create an employee manually directly in C4C.
Resolution
In case you want to have User ID same as EmployeeID then this needs to be raised as a new requirement via Ideas channel.
See Also
Keywords
User ID same as Employee ID, no identityID tag, EmployeeID + Last name , KBA , no identityid tag , user id same as employee id , employeeid + last name , SRD-CC-IAM , Identity & Access Management , Problem