I am applying on the Canadian Express Entry scheme. In the application form they asked me if I have ever applied for immigration, refugee or citizenship status of Canada before? I did apply for a visit visa last year which was refused. Should I answer yes to this question? When I answer yes, they ask me to provide the Unique Client Identifier (UCI). I found a UCI on my visa letters, but the system is not accepting that UCI because the pattern is wrong. This link (http://www.cic.gc.ca/english/helpcentre/answer.asp?qnum=013&top=4) says that the UIC either has 8 digits or 10 digits but the UIC that I found on my letter starts with an alphabetic character followed by 12 digits. What should I do? The UCI field is not mandatory so I can choose to leave it blank, but will it be misrepresentation? Please advise.