Oops, just noticed that 2 years from the grant date (which I presume was 6 months before the Dec 2020 purchase date) would have been June 2022, which is after the dates your sold the stock. So you had a disqualifying disposition in which event you simply add your purchase price to the discount (which is included in Box 1 of the W-2) to get your cost basis. When divided by 5.886, this should equal Box 4 of the 3922.
