If your W2 has a 16 digit alphanumeric code ( 1 out of 4 w2 picked randomly this year by IRS May have that number) if so please insert that in the box, however if you W2 box 9 has nothing then make sure the cell in TurboTax prompt is blank ( by default it has instructions to under a number which needs to be deleted) otherwise the final submission would go in loop instead of Efile.
