It sounds like the X entry is under Review because no cost basis is being reported.
The issuer of the IRS form 1099-B either does not have that information or is not required to report the information.
You will be required to determine the cost basis from your person records or sales tickets.
Do you believe that you acquired this investment as a gift?
This TurboTax Help states:
Gifts
The basis of securities you receive as a gift depends on whether your ultimate sale of the stock produces a profit or loss. If you sell for a profit, your basis is the same as the basis of the previous owner.
In other words, the basis is transferred along with the property. If you sell for a loss, though, the basis is either the previous owner's basis or the value of the stock at the time of the gift, whichever is lower. In other words, you don't get to write off a loss that occurred while the donor owned the securities.
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