HA MQTT Broker Authentication Error

[ialexyi]

Hi,
There is an issue with the authentication to the MQTT Broker in Home Assistant. Could you please check it out? I have configured the ini file and the configuration section with the correct username, but the add-on is still using the incorrect username..

The error from the log:
Grott extension processing error: MQTTException('Connection Refused: not authorised.')

The masquitto broker log:
2024-08-02 08:34:10: Client Grott - HA disconnected, not authorised.

The add-on configuration section:

The add-on startup log shows the incorrect username:

Thanks for your contribution,
Alex