On Form 8949, Sales and Other Dispositions of Capital Assets, which is the form that will list your RSU transactions, there is a column (g) which is where you can enter an adjustment to the gain or loss for the transaction at issue. However, if you enter an adjustment in column (g) you will also have to enter the appropriate code in column (f). Code B is the code to use when you are making an adjustment to basis (box 1e).
In TurboTax online, on the page where you enter your RSU information, there is a box "The cost basis is incorrect or missing on my 1099-B." If you check that box, on the pages that follow you will be given the opportunity to enter the basis you believe is correct.
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