If you’re a non-resident or a deemed non-resident of Canada, you will not be able to NETFILE your tax return. You will have to print and mail or fax it to the CRA. (Fax is a temporary measure due to the long international mail delays).

To learn more, please visit TurboTax webpage: The Ultimate Tax Guide For Non-Residents

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It does not appear that TurboTax can help me as a non-resident.  I believe non-residents need to file on form 5013 which I don't believe TurboTax offers.  I wish TurboTax made this clearer before I spent a lot of time entering my information to populate the T1 forms (which I don't believe have any use for me).  I'll be requesting a refund.