NETGEAR AC750 WiFi Range Extender (EX3700-100NAS) / Chromecast / Google Home Assistant

Hello,

I have utilized EX3700 to extend my wifi network to the backyard. I have used different SSID to extend the network.

Wifi is now reaching everywhere in the backyard and it is working great.

However, when my mobile device is connected to the backyard extended network, it does not recognize as being on the same network as Chromecast, which is connected to the original network.

If I were to simply change the SSID of the backyard network to the same SSID as my main network, will it fix my issue?

Thank you very much in advance for your expertise.