Yes, you are correct. Form 3922 is used to make adjustments to the 1099B if the cost basis is not correct.
You need to enter the 1099B just as it is reported on the form, into TurboTax.
However, often the 1099B's cost basis does not include any amounts that were included in your W2 wages (or otherwise paid) when you received the stock, so it is often under-reporting the basis.
Here are more details about Form 3922 and your basis: Where do I enter Form 3922? Employee Stock Purchase Plans
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