It seems that the biggest challenge of your situation is determining your basis in the shares disposed of. If the fair market value (FMV) of the shares granted to you was reported on your W-2 as income, then your basis is the amount reported as income. If nothing was reported as income, then your basis is zero.
Once you determine that, you will take the cash paid to you in March of 2022, less your cost basis of the same number of shares and determine your gain. Then report it on Schedule D.
How to determine the cost basis of stock.
Where is Schedule D?
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