MKRNB1500 Won't connect to ArduinoIotCloud with Hologram sim

Hi,
I cannot connect to the Arduino Iot Cloud with my hologram sim. I can however connect fine with my cell phone sim.
This is the serial output error I get when trying to use the hologram sim card.

SIM card ok
GPRS.attachGPRS(): 4
Connected to GPRS Network
ArduinoIoTCloudTCP::handle_ConnectMqttBroker could not connect to mqtts-sa.iot.arduino.cc:8883
GPRS.isAccessAlive(): 1
Connected to Cellular Network
ArduinoIoTCloudTCP::handle_ConnectMqttBroker could not connect to mqtts-sa.iot.arduino.cc:8883
GPRS.isAccessAlive(): 1
Connected to Cellular Network
ArduinoIoTCloudTCP::handle_ConnectMqttBroker could not connect to mqtts-sa.iot.arduino.cc:8883
GPRS.isAccessAlive(): 1
Connected to Cellular Network

Can someone please help me understand what is wrong and what to do. I am familiar with basic arduino programing but not familiar with Iot projects. Thank You.

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