Issue with finalized documents

I have used TurboTax for years. This year, I filled in all of my information and set up my documents to mail. Once I printed the documents, I realized on of my adult children was left off as a dependent. He has been on every other tax year and was transferred over to this year, so I am not sure why he doesn't show up under the dependents section now.

Further complicating this issue, there is another glitch where when I filed, I get an immediate refusal from the IRS, which Turbo Tax says is because one of us requires a pin. After hours on the phone with the IRS and Turbo Tax a few years ago regarding this issue, all I can do is print and file my returns. TurboTax says this is an IRS issue, the IRS confirms none of us have or need a PIN.

I want to "unfinalize" my documents so that I can add my son back in as a dependent. How can I do that? I reached out to TurboTax and was told to file and amendment, which apparently I can't do at this time?

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