What is the error code you are receiving?
As per our TurboTax article: Using the code is optional, but can make the authentication process easier if you have to contact the CRA.
What is the NETFILE Access Code?
The NAC is intended to be used as an extra level of security to authenticate an individual during the NETFILE transmission process. This replaces having to provide the CRA with a specific line number of a previous year’s tax return when calling into the CRA to authenticate your account.
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