This is from the IRS website
https://www.irs.gov/faqs/electronic-filing-e-file/amended-returns/amended-returns
Question
Can I file an amended Form 1040-X electronically?
Answer
You can now submit the Form 1040-X, Amended U.S. Individual Income Tax Return electronically using available tax software products. Only tax year 2019 and 2020 Forms 1040 and 1040-SR returns that were originally e-filed can be amended electronically. You still have the option to submit a paper version of the Form 1040-X and should follow the instructions for preparing and submitting the paper form.
