IRCC’s client identification (client ID) number, also referred to as a unique client identifier (UCI), can be found on any official document issued by an IRCC office, case processing centre or a Canadian visa office outside Canada.
A client ID number can consist of up to 10 numbers (for example, 11-0000-0000).
This client ID number will need to be referenced for any communication with IRCC, or anything related to your Canadian immigration journey.
A person who has never dealt with IRCC before will not have a client ID number.
