This CRA website tells you how you can get a copy of your NOA: https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/a-copy-your-notice-assessment-reassessment.html

What is the NETFILE Access Code (NAC), and how do I use it?

Please see this Canada Revenue Agency (CRA) link for information about the NETFILE Access Code. You can Netfile without using the Netfile Access Code if you cannot locate it.  

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