I'm sorry Support gave you inaccurate information. I'm not a TT employee; I'm a volunteer in the Community.
I know it's a pain to have to mail a return. Prior to last year (I think), all amended returns had to be mailed. Hopefully, TurboTax will be able to assimilate more years' 1040-X into the e-file system.
*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***
