Unifi add-on can't logg in to controller

I’m trying out the Unifi add-on but I have some issues and some questions.
can’t logg on to the controller. Error: Invalid user name. I did not get any errors when installing, there is nothing in the Unifi or HA log.
I get to the login page (https://hassio:8443) Unifi versioin 5.10.19 and I’m running latest HA 0.88.2.
Using DuckDns, Samba and Mosquitto broker.

Is’t possible to run MQTT and Unifi add-on at the same time? I have seen different result in this forum, some can and some can’t my plan was to test but got an issue instead.