Credit Karma says it doesn't support Quebec.
I should probably give TransUnion a call. It's very possible that TransUnion has my wrong birthdate, given that this was the case with Equifax 10 years ago, and it may be because someone who may be me lied on an online form to get their first credit card at 17 (that person likely wanted to make online purchases and has never paid a cent of credit card interest).
I've checked my Equifax file a couple months ago through their free trial and everything is fine, and I've churned a couple of credit cards since, I have a mortgage, I have a car loan, I never had issues getting approved for any credit. So I'm under the impression that TransUnion doesn't matter at all in Quebec.