I am running the Ecobee plugin in API mode and it has been running rock solid in PG3 since @Jimbo.Automates released the current version with API, or Homekit backends.

I have been working on migrating this plugin (using API configuration) from PG3 into EISY-ui and having issues. A fair amount of my programs appear to run, but there are issues where programs evaluate thermostat temperatures and errors in the log files are present.

On this first post I don’t want to distract you with the specifics of the issues I am seeing, but whether the UDI community users have migrated their Ecobee API configured plugin into EISY-ui and everything is working as you expect and your log files show no concerns.

I know your issue is related to using your own Developer Key which I'll try to look into soon.

But for everyone else's info, I have migrated all of mine to Plugins and everything worked perfectly. But I am on the staging repo and don't recommend everyone use that but wait for eisy-ui 1.4.9 and PG3x 3.4.28 to be released to beta or production, although I'm not sure if that makes a difference.