Did you try disabling the Quantum WiFi? Then try searching the network for Alexa to connect.
access point mode would place the Netgear in control. The only thing the Quantum is doing is getting DHCP nothing else. And as I told another forum user you don’t want both WiFi on. The Netgear is superior so turn off the Quantum and then search for the Netgear routers SSID and have Alexa connect to that.