'26 Yukon rear screens won't function.

New '26 Yukon.

Whenever I try to activate the rear screens it will display something along of the lines of "tap accept to view terms and conditions" and then it won't load the T&C, so the screens are useless beyond cable input.

My give-a-shit meter is pretty low but it's a new rig and we do have small kids, so would be nice for road trips. And a new car should be 100% functional off the lot; so egg on my face for not thinking to test it at the time.

It spent a week at the dealership while the local guys and all levels of GM tech support coordinated over it. OnStar went full retard and has not been helpful. I just left a voicemail asking the dealer to go ahead and request hardware replacement; it's a good vehicle and I don't necessarily want to lemon law the thing but something is fucked up.

However, everyone is pretty sure it isn't a hardware issue. Any thoughts and shared experience would be helpful and my gratitude in advance.

ETA- the dealer staff and myself tried all the combos of resets and whatnot offered by onstar and various internet sites.