Your account most likely cannot be retrieved without a recovery phone number or email address, together with additional verification information such backup codes and the last password you used. It is advised that you use account recovery from the prior location or IP address where you accessed your account if you still wish to attempt the recovery process.
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Nest Thermostats that have recently received software updates to version 5.1. 3 or higher may experience a few problems, such as losing all functionality, charging the battery inefficiently, or shutting down entirely. To fix the problem and get your thermostat operating again, Nest advises recharging and restarting it.
Google Nest Not Working