Orbi RBR850 - can't run Amazon Prime Video and IPhone wifi calling fails to send voice

Thanks for the info. I'm not discounting that the hardware I have is the cause of the issue. I don't believe the ATT modem is causing the issue in anyway, specificly since the 'wired' connections all show the same issue with the Amazon Prime Video on each tv. It is interesting that you are using those other two satelites since I didn't think they would would work with the new RBK852 AX environment. In fact I thought that only one satelite  (RBS852) was the option currently (not that I need more), The older satelites wouldn't support the AX features, they are AC level communications only.