Service account credentials does not work with Google Assistant API

[qo4on]

When I use other apis like drive or sheets this code works:

SCOPES = ["https://www.googleapis.com/auth/assistant-sdk-prototype"]
credentials = service_account.Credentials.from_service_account_file(
              service_json_fp, scopes=SCOPES)

drive_api = build('drive', 'v3', credentials=credentials)

But when I try this:

assist_api = build('assistant', 'v1', credentials=credentials)

It returns an error. How can I run Google Assistant API?

[Fleker]

The Assistant API is not v1. The current version is v1alpha2. Additionally, I don't know that a service account would work at all as the API is geared towards personal accounts.

[qo4on]

Thanks for your help! Are you sure it's impossible? It would be more convenient than clicking on different pages to authorize. Moreover I have a Google console screenshot which allows that:

I tried these with no luck:

assist_api = build('assistant', 'v1alpha2', credentials=credentials)
HttpError: <HttpError 502 when requesting https://assistant.googleapis.com/$discovery/rest?version=v1alpha2 returned "Bad Gateway">

assist_api = build('embeddedassistant', 'v1alpha2', credentials=credentials)
HttpError: <HttpError 403 when requesting https://embeddedassistant.googleapis.com/$discovery/rest?version=v1alpha2 returned "The request is missing a valid API key.">

This api key works perfectly with drive and sheets.

[Fleker]

The Assistant API is meant to be run by individual users, not a server.

[qo4on]

Ok, thanks!