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We're unable to apply the free copy to your existing QuickBooks Self-Employed. Please take note that both TurboTax and QuickBooks Self-Employed should have the same login credentials.
If you have different sign-in information for the existing QuickBooks Self-Employed and TurboTax, then you will have to choose which account you want to use.
I've got this article for more information: Send your info to TurboTax if your QuickBooks Self-Employed account is different from your TurboTax ....
You can also reach out to our Customer Care Team for further assistance:
Feel free to reach out to me if you have any additional questions. Thanks.