Good day! In order to access your access code to netfile your 2024 returns, you cannot locate your NAC on the paper copy of your NOA or online in your “My Account”, you can call the CRA, and answer a few authentication questions before they provide you with the information requested.

For more information on how to use your access code with TurboTax, please visit this page:
https://turbotax.intuit.ca/tips/netfile-access-code-nac-12156

After filing your income tax return  each year, you will receive a Notice of Assessment (NOA). On the top right-hand corner of your Notice of Assessment, you will see an 8-character, alphanumeric code under the “Notice Details” section. This is your NETFILE Access Code.

There is more information on this topic here.