Stadia works with Chromecast, but not every Chromecast device. There are many issues that can prevent it from connecting, even if everything is technically compatible. To connect Stadia to Chromecast, make sure you have a compatible device, that your firmware is up to date, and that there are no issues with your network.
How to Fix Chromecast "Cannot Connect to Wi-Fi" Issue
If a Chromecast isn't working properly with Stadia, it's usually due to one of the following reasons:
If you’re unable to connect Stadia to your Chromecast, during initial setup or later, follow these troubleshooting tips to get it working:
Check Google’s list of compatible Chromecast hardware. Check to see if your Chromecast is compatible with Stadia. Stadia only worked with the specific batch of Chromecast Ultra devices that came with Founders Kits when it launched. It’s been expanded since then, but there are still some Chromecasts that Stadia won’t work with, and others that require you to sideload the Stadia app to get it working.