Chromecast and Chromecast Audio devices can only remember one Wi-Fi network at a time. If you changed your Wi-Fi network and your device isn't currently connected to a Wi-Fi network, skip the steps

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Oct 27, 2018 Screen mirroring to Chromecast without wifi ??? - Android Dec 12, 2017 Chromecast built-in - Audio Chromecast built-in speakers stream music over WiFi, which means you can control the music from anywhere within your WiFi network. With Bluetooth, your phone needs to be near the speaker or the How to Check if Your Chromecast Is Still Getting Updates