The popup explaining that question gives a bunch of reasons and refusal into US is one of them. Note that it also says "any immigration documentation issues" (I know TN is a non-immigrant status but I suspect that's not what they mean). ...here
https://www.screencast.com/t/vPRsZc3lJ
That's why I was highlighting it, the explanation includes something that most people (okay, I
) wouldn't consider to apply. But for all I know, a lawyer might say that presenting yourself at the border with inadequate documentation for a TN-status application is technically a violation of immigration law.
=aw
IMO TN being a “non-immigrant” visa has no bearing to the screenshot.
What do you meant earlier when you indicated you did not obtain TN status? Were you declared inadmissible by CBP? If so, you ought to include that as 1.), CBP would already have a record of incident (and subsequently allowing entry) and 2.) leaving it out already tells them you are not completely truthful in your application.