I think I found the issue. When doing federal taxes and you enter details for you W-2G - there is no there is no information entered in box 18 - nor is it mandatory to do so. But in the final check for errors with Turbo Tax - you are prompted to enter a locality. Once you enter that - the review message is gone.
the original message to the left of the entries when completed state in a red box - "Please Review".
Regards
Dirk