When I bring up the form 1040X in ProSeries, it tells me that the EF 1040X will be ready on 3/25/21.. That was my first step to see if i could file. The second step I took was to go IRS.gov and look for the Form 1040X. And that form only goes thru the tax year 2019 for options. So, you see, you just can't do it yet. But, you could have done the above couple of steps.
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