When connected through my Orbi RBK50, my AT&T Uverse cable is not working. Does anyone know how to get all Uverse receivers working properly with the Orbi router (NOT in AP mode) based on the setup below?

See Attached Network Map Diagram

If an AT&T receiver is connected directly to AT&T's Pace router/modem, the receiver works fine.
If an AT&T receiver is connected via my Orbi router, I'm able to watch SD channels however unable to watch any HD channels. The HD channels will come on for approx. 15 seconds, then lose signal and display the screen suggesting I reboot the receiver. After I reboot the receiver, the channel will come on for about 15 seconds again, then lose signal.

I CANNOT run Orbi in AP mode. Using Circle Go to manage our kid's devices is a key reason I selected the Orbi vs a different mesh system.

I have 4 AT&T Uverse receivers located in 4 different rooms throughout our 2-story home. The AT&T fiber optic line comes into the house via our 1st Floor Media Room to an AT&T Pace 5268AC router/modem. The AT&T router/modem connects to a Netgear GS116Ev2 switch. From this switch I connect to the Orbi router, which then connects back to the switch. This switch then distributes to the rest of my home network, connecting to a Netgear GS108 in each room (1st Floor Living Room, 2nd Floor Bedroom, 2nd Floor Office).

Each room has various devices - TV's, Apple TV, gaming devices, Philips Hue, etc. Within each room is a Uverse receiver. Because of this setup, except for the Media Room where AT&T's fiber comes in...it's impossible to connect the Uverse boxes directly to the AT&T Pace router/modem.

The problem is NOT that I'm set up this way. Prior to getting Orbi, the Pace router/modem was connected directly to the Netgear switch in the Media Room, then distributed to the Netgear switches throughout the house (Pace->Switch 1->Switch 2->Uverse Receiver). Our Uverse cable receivers worked fine with that setup. It was introducing the Orbi that caused this issue.

Thanks for any help you can provide!!!

Network Map

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AT&T Uverse Cable Not Working With Orbi RBK50 (AC3000)