When I type in my SIN number, it says that it is invalid, why is this?

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This is the U. S. Site. Do you need Canada?

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Are you asking about a Canadian tax return? This is the U.S. TurboTax AnswerXchange. Please post your question about Canadian taxes in the Canada TurboTax AnswerXchange, at the following link.

https://turbotax.community.intuit.ca/tax-help