I’ve tried rebooting, resetting, and disconnecting power for 3 minutes and reconnecting, downgrading the firmware and...

So I talked with apple support, after walking through settings in Airport Utility, it was discovered the 5Ghz network name was deleted or broadcasting as the same name as the 2Ghz (which won’t work). After re-adding a 5Ghz name, it’s broadcasting as normal. This can be found under the Airport Utility -> Device -> Edit -> Advanced -> Wifi settings -> 5GHz Name. https://support.apple.com/airport/repair...