Can't connect Nest thermostat to the app

If you're able to connect your Google Nest thermostat to Wi-Fi but you can’t add it to your account in the Nest or Google Home app, or an error message appears on your thermostat, follow these steps to fix the problem.

Note: If you can't connect your thermostat to Wi-Fi or all your Nest products are offline, refer to Troubleshoot Wi-Fi and connection issues article.
Nest thermostat entry key error display image.

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