It’s telling you exactly what’s going on. COMMUNICATION_ERROR, Not authorized to connect.
OH can’t successfully connect to the broker so it keeps trying.
Please How to use code fences for logs and code.
The error is telling you that you’ve missconfigured the MQTT Broker Thing. Mosquitto doesn’t think it’s allowed to connect. Did you provide a unique clientID in your Broker Thing? Did you create a username/password and correctly enter it in the Broker Thing?