Help installing Zigbee2MQTT on HomeAssistant Green

What is causing the error when I start Zigbee2MQTT?

2024-11-16 16:19:41] info: z2m: Connecting to MQTT server at mqtt://core-mosquitto:1883
[2024-11-16 16:19:42] error: z2m: MQTT error: Connection refused: Not authorized

You have the wrong password for MQTT