Can someone explain me how to reclaim taxes from an RSU sale due to BUW being turned on? Accidentally turned this one, resulting in +24% tax (total of 54% tax now)...

Have a 1099-B form and have matched the sales proceeds with the cost basis. However, due to BUW being turned on, my tax has been 54% (increase of 24%). I would like to retrieve the additional tax paid, but am unable to find a way to do so through the interface