This is a common problem reported here by TurboTax users who try to amend,
On the other hand.
There are other TurboTax users who report success with TurboTax 1040-X process.
It is a mystery.
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The blank form in fillable PDF format and its instructions are available at www.irs.gov.
Refer to the Instructions for what is to be attached to Form 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.
Mail to the address shown in the most recent version of Instructions.
IRS says;
E-filed and paper 1040-X are processed the same way.
your paper 1040-X should show in the IRS website after three weeks.
