No installation config window

[novski]

Hi
Should I get a config window when fresh installed?
I get this:

I tried to use the manual config (by getting the access and refresh token by curl) then, but my token does not get accepted.
No *valid* token present in persistent storage. Nor is there a "token" configured in the configuration. Please re-setup this plugin.
Miele API request https://api.mcs3.miele.com/v1/devices?language= failed with status 401: "Unauthorized".

What should a valid config look like?
This is my try:

{
    "platform": "Miele@home",
    "name": "Miele@home",
    "clientID": "xxxx",
    "clientSecret": "xxxx",
    "accessToken": "xxxx",
    "refresh_token": "xxxxx"
}

edit:
Seams to be an iframe thing: