No, disneyplus.com/begin is not required for setting up Chromecast. The Chromecast setup focuses on connecting the device to your TV and Wi-Fi network using the Google Home app. However, if you’re using Disney+ with Chromecast, you’ll need an active Disney+ subscription. If you’re a new user, you may need to activate your account using disneyplus.com/begin by entering an 8-digit code on the website. This step ensures your Disney+ account is linked to your devices. Once activated, you can cast Disney+ content to your Chromecast from a smartphone or other compatible devices with the Disney+ app installed.