Nest thermostat listed as Unavailable

Hi guys

It’s been a long time since I’ve setup the Nest Integrations however with the newest update I was told you don’t need any nest information within the configuration.yml file.

The problem I’m having is that one of my three Nest thermostats is listed as “Unavailable”. This particular thermostat is a Nest Gen 1 thermostat whereas the other 2 that work as Gen 2. I’ve manually restarted the thermostat hoping that would allow for the pick up, but that’s not working either.

I’ve tried disabling and enabling device and this doesn’t work and restarting home assistant.
I’m not sure what exactly to do at this point.