Wio LTE Cat M1/NB-IoT fails to MQTT connect with long password


I am trying to connect to an MQTT server (Adafruit IO) that requires authentication with username and password/key. It seems that there is a length restriction with the U-blox R410 modem AT command AT+UMQTT=4,, (via function call MqttClient.connect(id,username, password)). Executing this command from Arduino sketch results in failure. Unfortunately, I cannot reduce length server-side. Any known workaround?

Thanks for your support.