Below are some key points to get more clarity regarding your unique code.
To maintain the database uniqueness and avoid overlapping of data for employees with the same names, an employee code can be an identifier.
Fill in the request form with the personal email address. The same will be stored in the database for any further communications.
Using this unique identifier number i.e, Employee code, the user can proceed with the further Sign Up formalities on the site.
The organisation also requires employee code to fetch all details about an employee.