This page is dedicated to all of the stuff I've learned about Home Assistant
In order to activate named-user accounts in Samba configuration, you MUST disable the Guest account.
In order to get this working, I had to omit the port. My UVC server (a UAS) has the web interface on 7443, but I guess the API is on 2080.
When setting up UniFI Controller WiFi presence detection, if you have multiple sites, you must enter the site ID (the hex version, not by name).
When setting up a tracker, it's best to check the log for any failure of the tracker to load - the list of trackable devices won't show up until it does load successfully, and then when an event is generated they'll show up in the known_devices.yaml file.
I went with the add-on Mosquitto broker, since the built-in one was reported to have memory leak issues. Note that you still have to add 'mqtt' as a platform wit the broker directive in your configuration.yaml file point to the local instance to get it to work.
You have to go to Services to run the aTV scan service to find the login info to add to the config (go back to Services and run Authenticate). Make sure Home Sharing is on. https://www.youtube.com/watch?v=WIjyerTfQMw