I have recently added a nest thermostat and gone through setting things up in the nest developer system. I now have a new card in the UI saying “New devices discovered”, but when I click “check it out” I just getting a loading spinner and nothing happens, if I refresh the page ‘/config/integrations’ I get a 404 not found error.
Same issue here!
I have installed Home Assistant using pip3. Now got version 0.86.4
When I got to http://XXX:8123/config/integrations I get message “Not Found”.
BTW: I have also no /config I don’t know if there is supposed to be something there, or if I’m missing a plugin to install.
Has someone an idea?
Thank you 
Ok, found it, you need to add “config:” to your configuration.yaml file to activate configuration UI.