Post request isn't receiving id from object

 [HttpPost]
        public async Task<ActionResult> CreateEmployee([FromBody]CreateEmployeeDto employeeDto)
        {
            var department = await _context.Departments.FindAsync(employeeDto.DepartmentId);

            if (department is null) {
                return NotFound();
            }

            var employee = new Employee()
            {
                EmployeeId = Guid.NewGuid(),
                FirstName = employeeDto.FirstName,
                LastName = employeeDto.LastName,
                PhoneNumber = employeeDto.PhoneNumber,
                Salary = employeeDto.Salary,
                Email = employeeDto.Email,
                Department = department
            };

            await _context.Employees.AddAsync(employee);
            await _context.SaveChangesAsync();

            return Ok(employee);
        }