A reminder that most existing (not-bundled) Chromecast devices will not support Stadia until they're updated over the next few weeks. You can check if your Chromecast Ultra can run Stadia by checking if it's running version 1.42.180348 or above. If your Chromecast is not on that version, attempting to play games on that Chromecast will fail until it receives the upcoming Stadia update. For now, we recommend using the Chromecast Ultra in your bundle to play.
Spent far too much time trying to play with my existing chromecast ultra. There should have been a warning in the box or have programmed into the app to run a check on the firmware version!
I did the same. I have 3 of them around the house and was losing my mind why it wasn't working. Haha.
Just releasing the update beforehand would have been good. Plus it would have been something to have done whilst waiting for launch.
Indeed, something in the app to identify the version and notify to say that it is before a specific version would have been nice.