I've read through all the other discussions on this and I haven't found the answer I'm looking for.  Here's what I have.

Client original 1040 filed electronically by someone else.  I duplicated the return exactly as it was. Saved it.

Now have clicked on form 1040X marked 2021 - this is fine.  

Made changes to return to correct errors and omissions from original.  Clicked box to file amended electronically and the box under stating original file was successfully efiled.  Saved as a new file. 

Error comes up cannot efile Amended return when electronic filing of return is not marked in Part VI.  When I mark this it changes from Amended to Federal return. Which isn't right because it was already filed and get a rejected when I try to efile.

Went to EF and it won't electronically file as long as there is an error in the return if I leave the box unchecked .  I've done this over and over 4 times now - really frustrated.  Can someone help??  I've followed step by step and still can't resolve this.  Taxpayer has paid original amount due on original return, everything completed with it.  Help, help, help. Amended returns need to be easier than this merry go round! I do a lot of these through out the year, and I do not want to fight this program every time if there isn't a good way to accomplish the job