It appears that TurboTax Desktop for prior years does not support E-file for amendments like TurboTax Online does. It is in hopes that one day the prior year E-file for amends will become supported on TurboTax Desktop. Until then to file your amended return you may print and file by mail.
Here is a link with instructions on how to do so: How do I print and mail a return in TurboTax Desktop for Windows?
We have requested an update to the amend return e-file articles to specify this applies to the Online version only.
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