Flame Boss MQTT and requesting some advice for integration:

Hi there,

Amazing description. was easy to follow.
my entitles created under HA. For some reason, the value was unknown so I started to check the Mosquito broker logs under HA.
I could see the following there

1631433983: Connecting bridge myflameboss.com (s9.myflameboss.com:1883)
1631433983: Connection Refused: broker unavailable
1631433983: Socket error on client local.core-mosquitto.myflameboss.com, disconnecting

Any idea what could went wrong?
Would appreciate any help.