On my account that starts with Y, I attempted to connect my Nest account to Alarm.com, using the web interface, Setup>Devices>Automation Devices.
Everything appears to connect successfully, the button switches to “Switch Nest Account”. I even get Alarm.com notifications if the Nest thermostat is offline. HOWEVER, no where in the web interface, or in the app (tried multiple devices) do the controls appear. I’ve tried deleting and reconnecting the Nest account, and signing in and out of the app several times.
I’m not seeing a Nest connected on this account currently, have you deleted the Nest from your account?
Note that thermostat controls would not be accessed by the settings menus. Thermostat controls would be accessed by the thermostat card which will populate on the home page of the app/website when a thermostat is present.
If it is not linked to the account, could you go ahead and try linking it? We will take a look for problems once that is complete.