Below are mentioned the steps to activate twitch tv on Google Chromecast are as follows:
When you first set up your Google Chromecast, you should connect the device to the HDMI port on your TV. Once the device is connected, download and install the Google Home app (available for Android or iOS). Once the app is downloaded, go to your Twitch account and tap the cast icon. From inside the video player, select Chromecast. Then, you can begin watching Twitch videos on your TV.

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