Notice that you use an obsolete setting

[mjeanrichard]

2023-08-09 12:12:58.736459+00:00 level=INFO eventId=4102 eventName=Silverback.Integration.MQTT_MqttClientLogWarning sourceContext="Silverback.Messaging.Broker.Mqtt.DefaultMqttNetLogger" message="Warning from MqttClient (MqttClient): 'Client will now throw an MqttConnectingFailedException. This is obsolete and will be removed in the future. Consider setting ThrowOnNonSuccessfulResponseFromServer=False in client options.'." source="MqttClient" logMessage="Client will now throw an MqttConnectingFailedException. This is obsolete and will be removed in the future. Consider setting ThrowOnNonSuccessfulResponseFromServer=False in client options."