If the T4A is "cancelled", that means it's no longer valid. You would need to remove the cancelled T4A instead of adding it.
To remove a T4A slip in TurboTax Online:
This TurboTax FAQ has more information on how to ReFILE your return: I've filed my tax return. Can I still make changes?
You can login to TurboTax Online 2020 here: Sign In to TurboTax Online 2020
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