UCI is always in format xxxx-xxxx. I don't think it's there.mee to , i am also confused - someone told me so i asked it on forum .
there are document number and FPA number but dont know which is UCI .
Client ID Number / Unique Client Identifier
You will find this number, also referred to as a Unique Client Identifier, on official documents issued to you from a Citizenship and Immigration Canada office, Case Processing Centre or visa office where you submitted your application. Your Client ID Number/Unique Client Identifier has four (4) numbers, a hyphen (-), and four (4) more numbers. (Example: 0000-0000).