Sorry. I misread your post. I think you're good. If you are that concerned, you can call them up but then go on hold for an hour or so. Right now because everyone is calling Samsung about the phone delays, perhaps you might want to hold off on calling until possibly in May. That is, unless you come into issues with the phone. If you have everything all registered as Canada, I think it is fine.
Hi, We suggest you to contact our online support team they will help you out with the address issue.
Here's the link to contact online support
So if you are in Canada you don't need to worry if your Samsung Care+ Registration Email shows CN as the country. Strange but true.