RBR50 - Mobile Devices Can't Connect to Internet

All of the mobile devices that I typically use on my network can no longer access the internet through the WiFi network. They connect to the WiFi but can't get to the internet. Computers, game console, and WiFi cameras still work fine. 

I've reset my modem, router, and all devices. I have updated the firmware on the router, and reset network settings on my devices, with no luck.

I have adjusted router settings such as turning off parental controls, adjusting the router maximum power, connecting to the satellite instead, turning off the satellite completely, changing the WiFi channel numbers, and connecting through a Guest WiFi, all with no change to the result.

The specific devices that won't work are:

iPhone 13 Pro, iOS 15.6.1

iPhone 13 Pro, iOS 16.0

iPhone XR, iOS 15.2.1

iPad Pro (12.9 inch), OS 15.3

Dell Chromebook 11

Dell Chromebook 3100

I would have guessed it's an Apple issue, except for the chromebooks not working

I can see all devices as connected to 5GHz in the Router Configuration (browser based). Other devices such as laptops and my Xbox connect via 5GHz just fine. I'm going to factory reset the router next, but was hoping to avoid that option. Spectrum (my internet provider) says that it's a router problem because some devices work fine.