Log error when latching gateway through mqtt

Hi, i have tried to latch gateway on chipstack via mqtt forwarder I have followed the document as well but I can not see gateway on my dashboard, I am giving a pic of logs here. there is 2 option ap1 and ap2 card in my multitech gateway there is only 1 card which I activated as steps provided because I cant activate the card which I I don’t have in gateway so I activated only 1 card.

Please help me here, if I am doing anything wrong I want to see my gateway on dashboard as soon as possible.

Please see the Connect to MQTT Broker error in your logs. it looks like the MQTT Forwarder is unable to connect to your MQTT broker.