Thank you @RaifH for providing your answer. However, you did not explain the process for reporting the adjusted cost basis in TurboTax 2021. I vaguely remember that in prior years, I just manually entered the adjusted cost basis provided by E*Trade and everything worked out. However, in TT2021 (I'm using the Windows download product), regardless of whether or not I put in $0 or the adjusted amount for cost basis, the interview format eventually reaches a screen titled "Enter Vesting (or Release) Information" which asks for details related to sell-to-cover. This is confusing because when importing the RSU sales from E*Trade, it lists all individual sales, including the sell-to-cover ones. Intuitively, I can't imagine I'm supposed to put in the same information for both the original sell-to-cover sale and the eventual sale of the remaining shares in the lot, unless I'm misunderstanding something. How should I go about providing the correct adjusted cost basis for all sales?
