Same problem. At first I removed the old configs from the .yaml: same error. Two printers shared the same API key, so I thought that could be the culprit. Changed it on one of them, but that didn’t work.
Not sure if I’m missing something.
I got a crapload of automations tied into several octoprint sensors for temperature monitoring/control, fume extraction, notifications, camera’s etc. So I’d be really happy if we could add more than one printer like before!