TurboTax 2020 works nearly fine for 1 ESPP sale. If you have like I do 2 ESPP vesting periods a year and 2 sales, the second overwrites the first. So you can only get the basis adjusted to one of them. The only solution I found or the best one, was to ignore the ESPP thing and the 3922 stuff and just do the thing by hand, that is say that the reported basis is wrong, compute the adjustment myself and leave it at that without mentioning that this is ESPP.
