404
http.unknown_hosthttpThis host does not serve this surface
Returned by the implementation; no specification rule declares it yet.
The request arrived at a hostname that is not mapped to the surface you are calling — a partner call to the console host, for instance.
Why the API refuses
this host does not serve this surface
What to do
Use the base URL for the partner surface from your environment's configuration rather than assembling a host from parts.