Thanks!johnny123 said:It's not confusing. UCI number stands for Unique Client Identifier Number, as in Client Identification Number.
"A Client Identification Number (Client ID), also referred to as a Unique Client Identifier Number (UCI), can be found on any official document issued by a Citizenship and Immigration Canada office, Case Processing Centre or a Canadian visa office outside Canada.
A Client ID consists of four numbers, a hyphen (-) and four (4) more numbers (example: 0000-0000).
A person who has never dealt with Citizenship and Immigration Canada before will not have a Client Identification Number."
http://www.cic.gc.ca/english/helpcentre/glossary.asp
They are not asking for any proof of UCI from you, but, in your case, for CELPIP results. The way they attention the letter and are communicating with you is through your UCI number. Let's say your name is John Smith, and UCI 1234-4321. They just said "Hey John Smith, with UCI 1234-4321, you need to provide us....". This is to make it more clear for them, because there can be lots of John Smiths, but there will be only one with number 1234-4321. Get it now?
I did not know this first bullet was in all communication, since this was my first letter...What a confusing way to write a letter.
At least others will know in the future that there is no proof required.
Call centre agents also need a training! they confirmed to me I needed to attach a document with my UCI along with my Celpip.