You are correct TurboTax will not accept zero for outstanding mortgage principal since that should be the principal amount on 1 Jan 2020 or whenever you took out the loan if this was new loan or refi in 2020. You will need to use the original amount from your form 1098 that was corrected.
You will enter the original information for any boxes that were not changed on the corrected form.
One additional note for you. If the form changed the interest paid amount, but you are using the standard deduction your tax will not change and thus you will not need to amend your tax return.
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