We support Airplay only through Chrome browsers on a Mac laptop or desktop.

To screen mirror from a Google Chrome browser on a Mac laptop/desktop to Apple TV:
Connect your Mac to the same Wi-Fi network as your Apple TV.
On your Mac, click the menu bar at the top of your screen. If you don't see the menu, go to Apple menu > System Preferences > Displays, then select Show mirroring options in the menu bar when available.
Choose your Apple TV.
An AirPlay passcode appears on your TV screen, enter the passcode on your Mac.

You can refer https://support.apple.com/en-gb/HT204291 for more details.

How do I cast on ROKU?

How do I cast using Google Chromecast?

We don't support casting on iOS devices(iPhone/iPad) & Safari browsers due to security reasons
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