The letter from the IRS was generated because you did not report the information on the Form 1099-B, not because of your W-2 Box 14 information. The Form 1099-B indicates that some of the RSU stock was sold and you need to report that as part of your return to show a gain or loss.
The information reported in Box 14 of your W-2 is simply there for information to let you know that RSU income was included in Box 1 of your W-2. That amount in Box 14 does not transfer to your Form 1040 in any manner.
Take a look at the following TurboTax article for more information and details. The video is particularly helpful:
What are restricted stock units (RSUs) and how do I report them?
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