What Is the IRCC Client Identification Number (UCI)? A Complete Guide for Immigration Applicants
The IRCC client identification number — also called a UCI or unique client identifier — is the personal reference number that follows you through every Canadian immigration application you will ever make. This guide explains what it is, where to find it on your documents, when you will need it, and what to do if you are a first-time applicant who does not have one yet.