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If both the existing and the new Wi-Fi networks are available, try these steps:
If the original Wi-Fi network is no longer available or accessible, you can perform a factory reset on your Google Nest Audio.
Once you complete the factory reset of your device, you'll need to set up your Nest Audio again on your new home Wi-Fi network and link a Google account to your device since it will erase all your previous data.
Hope this helps.