Per the Instructions for filing the 1040x; on page 5 it states IF you are filing a "Carryback Claim" DO "include both pages of the 1040 as well as SCH A, C, D or any other forms that would show the original loss AND write on the top of the 1040 and SCH A ... "ATTACHMENT TO FORM 1040x -COPY ONLY- DO NOT PROCESS".
TT does put "CARRYBACK CLAIM" on the 1040x but TT does not write "ATTACHMENT......" on the top of any other pages! You need to do this (or at least I had to)
