Unifi Controller - no adopted controllers on unifi ui com

Fresh install on Ubuntu Server 64 bit, with portainer 2.6.2 and docker-ce 20.10.8
Unifi Controller installed with the docker-compose.yaml on github linuxserver/docker-unifi-controller

When I check network.unifi.ui.com i would expect this install to show up but its empty. In Unifi controller, remote control status is stuck on ‘Connecting’

Unifi log shows the following:

[2021-08-17T03:13:57,328] WARN elite - controller is not connected to cloud, skipping Cloud check
[2021-08-17T03:14:17,163] <MQTT Con: 0d033428-32e9-498b-8aec-9d1b63dd7e7e:1351802666> WARN AwsIotMqttConnectionListener - Connect request failure
org.eclipse.paho.client.mqttv3.MqttException: MqttException