AT&T U-verse app not working – U-verse Review

I tried setting up a receiver and get error message WI-FI not found on my iPhone 11 Pro Max running 15.3 IOS. I went to channel 9301 on my particular receiver and tried to set it up. The app still showed no network found even though they are both connected to the same network. No devices were enabled, could not set up device. Rebooted phone and receiver, deleted and reinstalled the app to no avail. I pulled out my old iPhone 6 running 12.5 IOS and it works like a charm. Is there going to be an update the app to make it compatible to the newer IOS versions.
Review by CurtSmooth on U-verse.