Form field is appearing blank in the Notification emails

I feel like it takes several emails for you to understand what I;m actually telling you, clearly. I told you I used the unique id and it wasn't working. I know where to find it, the issue is, it is NOT WORKING! I am putting that into the notification email as a field and when I recieve the email, it is BLANK!

This is a re-post of a comment on How to Find Field IDs and Names