@Skywalker13
When you screen mirror, your original device (a Google Pixel 5 in your case) is doing the streaming, and your phone is putting the content on your TV via your Google Cast compatible device.
When you cast from a Google phone (or any Google Cast supported device), the phone is not actually doing the streaming. It is communicating with a compatible device, and instructing that device to launch the appropriate app.
For example, suppose I have a Google Pixel phone. Now, suppose I launch YouTube on that phone and start watching a video. I then decide to cast it to my TV. I click the Cast button on the YouTube app, and a list of devices appears. I pick the device and the video plays on that second device.
But here's what's actually happening. My Google Pixel communicates to the device I selected (Roku), and that device launches its YouTube app. The Pixel tells my Roku what YouTube video to play, and how far along in the video to go. My Roku then launches the YouTube app, finds the video, launches the video, then moves to the correct timestamp within the video.
Some thing the phone is actually doing the streaming, but it's not. It has handed the streaming over to the Roku device. A connection is maintained for FF and RW. But, once the Roku stars playing, I can shut my phone completely down and the video will still play on the Roku. Because it's the Roku doing the streaming, not the phone. The streaming was handed off.
So, mirroring is not the same thing as casting. Google Cast works in a different way.
That means that if there is not an app for Roku, you can't cast that particularly service to Roku. You're wanting to cast Sky Go. Is there a Sky Go app for Roku? If not, you can't cast Sky Go to Roku. If there is, you should be able to cast it.
DBDukes
Roku Community Streaming Expert
Note: I am not a Roku employee.
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