After looking in the forums and exchanging message via Twitter with Stadia support I stumbled on what my specific problem was. Like many people I was trying to add another Chrome Cast Ultra "CCU" to...
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After looking in the forums and exchanging message via Twitter with Stadia support I stumbled on what my specific problem was. Like many people I was trying to add another Chrome Cast Ultra "CCU" to my Stadia app but when I would try the App would just say there wasnt any Chromecast nearby. What I stumbled on is I have an Actiontec Single Dual-Band Wireless Extender (WCB3000N) I broadcast the same SSID, and its the same "network" technically but Im pretty sure Chromecast has some form of issue in general. Often I'd notice that I would try and cast something but the Chromecast wont show up. When I moved my phone and controller to nearest access point (main one) I was able to see the Chromecast listed and get it added. Im not sure if this is a specific issue with this older ActionTech Extended, or extender / mesh network setups but given the number of posts I found hopefully if you are running a similar setup this helps. One thing that lead me to think it was the wireless SSID broadcasting was that the Stadia controller was able to unlock the CCU I was trying to add. So thats a sign that from a network stand point it could talk to it. Id just get stuck on the screen that I needed to add it via the APP.