Discovery works, only partly

Hi, I’m new to the bord and to hassio.

I installed hassio (Docker on Debian), and it works, some kind of.

It detected my Hue lamps and sensors, my HP MFC and Fritz Box and repeater, but they give an error, maybe more on that later.

My current problem is to integrate my Harmony Hub and my Yamaha Receiver.

I tried adding the Harmony, but hassio then complains that this device is already configured.

But I can’t find it anywhere (grepped the whole config dir).

I tried adding them manually in /config/configuration.yaml like so

remote:
  - platform: harmony
    name: HarmonyHub
    host: 192.168.99.131
    activity: Watch TV

media_player:
  - platform: yamaha
    name: RXA810
    host: 192.168.99.31

But nothing shows up.

Any hints?

Kind regards,
Micha

Nobody an idea where to start searching?