If you indicated when entering your 1099-B that 'cost basis is missing or incorrect' then entered the correct Cost Basis on the next page, you can enter it as a regular stock sale in TurboTax (not employee stock). Your Cost Basis is the exercise price, plus the discount reported on your W-2.
You may want to delete/re-enter your 1099-B. If you're using TurboTax Online, clear your Cache and Cookies before re-entering. You should end up with a small gain or loss, and Form 8949.
Here's more detailed info on Reporting NQSO Sales and Calculating Basis for NQSO.
@CatMc
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