Additional Nest thermostat won't add to HA

I have had a Nest developer account with HA integration for the past year. Everything has been working fine until one of my Nest thermostats went bad and I had to replace it. I deleted the old thermostat from my nest app and then added the new one. Everything is fine in the Nest app. HA, however, is not recognizing the thermostat. I tried deleting my Nest integration and then went through the adding back the JSON from a backup to the core.config_entries. If I add back the core.device and core.entity registries, I’ll get an entity in the Nest integration which is unavailable. Any suggestions?