You are amending 2020.
You will have to file on paper.
You don't need to supply an IP PIN to paper file an amended tax return (1040-X).
Do not include your old 1040 nor your revised 1040 because the Form 1040-X reflects any changes there and becomes your new tax return.
Include any new/corrected document only if it shows federal tax withheld, and include in order only those Sequence Numbered tax forms and Schedules that changed or were added due to your amendment.
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