Just did mine yesterday so it is still fresh in my mind. When you go into the Tax Interview it gives you a list (country by country) of what number to use if you are not based in the USA. For example, here in the UK, you put in your National Insurance Number. Suggest you go back in and see what is listed for Canada and then use that. Hope that helps! Regards, David.
On a side note I also did my Adobe one yesterday and was impressed that the moment I hit Submit, I got an email back saying my form was validated