I tried settingthe following combinations, none of which worked: querystring is ?industry=automotive querystring is /?industry=automotive querystring contains ?industry=automotive querystring contains /?industry=automotive
Just for some context, the form is not on a Marketo page, but the page it's on has Munchkin code already.
Technically, the querystring is everything after the ?, so if you remove that from the beginning of your constraints, everything should work properly. I use querystring-based triggers for form fill-outs all the time, and I typically use either a "contains" or "is" constraint. If you include the ?, nothing works.