You report the sale.
Once the stock was "yours" then YOU are the only one that can sell it. (If you look through all the original paperwork when the grant was handed out I'll bet you agreed that the company could do that "in your name." Maybe you could have reached into your pocket and handed the company all the money needed "for taxes" and kept all the stock; some grants do allow that.)
Your basis in the stock almost certainly is the same as the per share "fair market value" used to calculate the compensation created by your receipt of the stock and reported on your W-2. So, typically, a "same day" sale - acquisition and sale happening simultaneously - results in a small loss due to selling commissions and fees.
If the 1099-B is reporting the wrong basis then enter it exactly as it reads and click the blue "I'll enter additional info" button and enter the correct basis on the following page.
Tom Young
