That’s ok. If the box is empty on your W-2, leave the box blank when you enter your W-2 info. Only some W-2s will have a verification code this year.
On the other hand, if you had a verification code on your W-2, but experienced an error after entering it, just delete the code. It won’t delay the processing of your tax return.
Or, follow this link if you were actually looking for help with the verification code used to sign in to your TurboTax account.