How does Lattice identify an employee?
Lattice uses two unique identifiers to identify an employee: email and external ID. An email address is required when creating an employee in Lattice. The email address will be used to identify the employee profile by default.
However, some companies may use an external ID within their HRIS to match a profile with an employee. If an admin uploads or adds an external ID to the profile of an employee, the ID overrides the email address as the unique identifier. This allows you to change the email address of an employee via CSV upload without duplicating profiles.