I removed and installed all parts of the NST Manager this morning because both of my Nest devices (Thermostat & Nest Protect) stopped working in the Smartthings App some time ago. After the reinstall, I created a Nest Developer account in order to obtain the needed Client ID and Client Secret fields for the Nest Manager SmartApp in the Smartthings IDE.
After entering my Nest login credentials in the NST smartapp on my phone, I note that the Thermostat and Nest Protect devices don’t show up. They are not shown in the Device List of the IDE, either.
I rebooted my hub - no change.