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You have registered the device on Music Center, but no sound is output from the device when using some applications via a Wi-Fi connection, such as YouTube
When using some applications that are not compatible with Chromecast, such as YouTube, no sound is output from the device via a Wi-Fi connection. Perform the pairing procedure to establish a BLUETOOTH connection.
When the device has the BLUETOOTH connection history, the Wi-Fi connection is automatically switched to the BLUETOOTH connection.