You need to edit your investment sale entry and insure that for the type of investment sold you marked it ESPP stock. After the you enter the sale, you will see a screen that says Adjust your cost basis to ensure your best outcome. On that screen you can indicate that you want to enter your correct cost basis or that you need help finding it:

If you need help finding your cost basis, later in that section you will see a screen on which you can enter the information from Form 3922 and Form 8949 will be populated with the correct information to report your employee stock sales:

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