No internet on gym wifi

My anytime fitness has some kind of unifi router. There is a captive portal when you use it. With nextdns enabled the wifi connects but there is no internet.
 

I get similar issues when using wifi provider at my local grocery store.

I'm using iOS. I installed NextDNS using a profile just a month ago.

I saw other posts like this but didn't see any suggestions for what to do.

Please let me know if there is anything simple I can do. For now I've cancelled my recurring subscription, I don't want to fiddle with this, it should just work out of the box. But I've still got it for the next month, so I can try some stuff.