Our ATT Nighthawk works with everything but we just cannot connect it to our XBOX, what is up?

Love the Nighthawk! Connects to Xbox One and everything else

The Nighthawk is out ONLY internet. Via ATT hot spot

But it just will not connect to any of our Xbox 360's. We have tried 3 models, none connect. Not sure if it has to do with DNS settings or what, heck maybe I have to manually enter this, not sure but it is very aggrevating to say the least