The starting point for entering your ISO sale information is the subsection ISO Exercise and Hold in the Investment Income category. If you started in that subsection, you should have seen the page with the question "Did you sell ISOs in 2021 that you purchased in a previous year?" That question appeared after the page that asked about less common situations.
The page "Did you sell ISOs in 2021 that you purchased in a previous year?" is where you can enter your AMT adjustment, which is referred to as a negative adjustment.
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