Not covered simply means that the broker who issued the Form 1099-B did not have knowledge of your actual cost basis and so is not reporting that to the IRS. You do enter your cost basis when you enter the Form 1099-B in TurboTax. Your cost basis in the stock is the value on the date the shares were vested and this same amount is included in your wages, Box 1 of your W-2. You will manually enter that cost basis when you enter the sale.
Keep in mind that you actually sold 100 shares. The company sold the first 30 shares on your behalf to pay the taxes for you so that you would not have a big tax bill later. Those taxes are also included in your W-2 as federal withholding, social security and medicare tax.
Since you sold the stock immediately after they were vested, you will likely have a selling price close to the cost basis (fair market value on the date vested) or even a small loss if there are selling expenses.
@uncletax1969
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