Update: We are in final internal testing of the 1040X flow.
You may see glimpses of the new flow, but the front end is not connected to the e-file process yet. We are working to hide this feature until the back end process is turned on to avoid confusion.
We are in the process of adding the ability to e-file the 1040X into the new e-file section.
We recommend you use a return tag to easily identify any 2021 1040X returns you need to electronically file.
We anticipate having this enabled by mid-February.