Per the IRS, Box 14 is for informational purposes. Some states use box 14 to report taxable or non-taxable items, and Turbotax can sometimes detect them correctly, but since there are no official IRS codes for reporting these state items, the codes are not standard and sometimes are not interpreted correctly.
If you are awarded an RSU that is not vested, it is not taxable. Any notation in box 14 is for your information only, and you don't have to enter it in Turbotax.
If you vested in your RSU, the value should be included in your box 1 taxable wages. Any notation in box 14 is for your information only, and you don't have to enter it in Turbotax. You should keep copies of your W-2, because whenever you sell the stock, your basis for determining capital gains will be the taxable value.
If you are vested in the RSUs and the value is only reported in box 14, and is not included in your box 1 wages, you need to get a corrected W-2 from your employer.
*Answers are correct to the best of my ability at the time of posting but do not constitute legal or tax advice.*
