I made a mistake and said that I did not have to answer credentials to log in to campground wifi. I do, but it was 15 days ago (I'm old) and it's only a one time thing. So I believe the problem is "captive portal" and Netgear EX6120 and EX6100V2 does not support "captive portal", nor did the tech on the 2nd support call even know what captive portal was and I could barely understand him! Go figure.
So seeing as jsb5717 has had experience with this one, I will order it up and try it:
https://www.amazon.com/gp/product/B0...e?ie=UTF8&th=1