The Federal Review flags an entry but doesn't accept input to change. A stock sale needed a Date Acquired, but it was already entered by downloading 1099-B.(verified)Fix?

Yes enter the information into Turbo Tax.

It is pretty common to receive a 1099-B with incomplete or missing information.   

If you would like more information about entering missing data, click on button in Turbo Tax.

If your 1099-B is from Chase Bank, there  may have been a problem downloading the original 1099-B.  For additional information see the following link:

Information regarding Chase Bank 1099-B downloads

[Edited 02/21/2021|12:52 pm pst]