+1(514) 937-9445 or Toll-free (Canada & US) +1 (888) 947-9445
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I wonder if redownloading the form would help. It didn't give me any trouble with a blank UCI. I've never lived in Canada though, so if you have, maybe that would cause it to want a number from your last visa or something? That's just a guess, though.
 
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