Error code N1 can be because you answered the question wrong—when it asked if it was your first time filing with the CRA, you said YES instead of NO, or vice versa.
Go back to your "tax profile" in your return and click on "Mandatory Questions." The first one asks, "Is this your first tax return being filed with the CRA?"
If you've ever filed a tax return before, or if someone has filed one for you, select No.
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