Chromecast- Airport Extreme: Not Casting

So I found a solution, I was on the phone with the support team about using chromecast with Airport Extreme, and I have compiled settings from google, to help in the support of using chromecast 1st generation with Airport extreme, You have to Isolate the band 2.4 from the 5Ghz and use all the devices you're wanting to cast to chromecast from on the same network 2.4 ghz. -Enable: Universal Plug and Play (UPnP), multicast, Internet Group Management Protocol (IGMP)

Disable: AP/client isolation, virtual private networks (VPNs), proxy servers, IGMP Proxy

VPNs and proxy servers should be disabled on your computer as well (if applicable).Chromecast (1st generation) is only compatible with 2.4 GHz Wi-Fi 802.11 b/g/n Wi-Fi networks, so it won't list 5 GHz networks when setting up the device. CCst must be on 2.4

To Isolate the networks you have to go into your AEBS and under the wireless tab, click on 5gz as active and rename it with 5ghz so you'll know which one it is. and then the other network at 2.4 will stay the same, you now have two isolated networks, and chromecast and devices must be on the same 2.4ghz network.

My chromecast now works fine!

Thank you Tesserax, I now have confirmation of what I was fearing, that I needed to get another apple tv

many thanks,