Google::Apis::ClientError: forbiddenForServiceAccounts: Service accounts cannot invite attendees without Domain-Wide Delegation of Authority

[RabeyaMuna]

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I have integrated Google Calander API to generate a meet link and send the invitation to the attendees which requires domain and enable of Domain-Wide Delegation. For that, we need to have an administrative account to enable it.

is there anyone who can provide me administrative account?
Is there any other of testing it rather than creating an administrative account to enable the Domain?

credentials.json

{
    "type": "",
    "project_id": "",
    "private_key_id": "",
    "private_key": "",
    "client_email": "",
    "client_id": "",
    "auth_uri": "",
    "token_uri": "",
    "auth_provider_x509_cert_url": "",
    "client_x509_cert_url": ""
}

google_calendar.rb

require 'google/apis/calendar_v3'
require 'googleauth'
require 'googleauth/stores/file_token_store'
require 'fileutils'

class GoogleCalendar
  def get_calendar_client
    scope = 'https://www.googleapis.com/auth/calendar'

    # privatekey = ENV.fetch('privatekey')

    # signing_key = OpenSSL::PKey::RSA.new(privatekey.gsub('\\n', "\n"), 'notasecret')
    # authorizer = Signet::OAuth2::Client.new(
    #   {
    #     signing_key: signing_key,
    #     token_credential_uri: 'https://oauth2.googleapis.com/token',
    #     # json_key_io: File.open('credentials.json'),
    #     audience: 'https://oauth2.googleapis.com/token',
    #     issuer: ENV.fetch('service_account_email', nil),
    #     person: 'munarabeya18@gmail.com',
    #     scope: scope
    #   }
    # )

    authorizer = Google::Auth::ServiceAccountCredentials.make_creds(
      json_key_io: File.open('credentials.json'),
      scope: scope
    )

    authorizer.fetch_access_token!

    client = Google::Apis::CalendarV3::CalendarService.new
    client.authorization = authorizer

    client
  end

  def create_event(_current_user, _summary, _start_time, _end_time, _attendee_emails)
    calendar_client = get_calendar_client
    # create an event
    event = Google::Apis::CalendarV3::Event.new(
      summary: 'My Meeting',
      start: Google::Apis::CalendarV3::EventDateTime.new(
      date_time: _start_time,
          time_zone: 'UTC'
      ),
      end: Google::Apis::CalendarV3::EventDateTime.new(
        date_time: _end_time,
        time_zone: 'UTC'
      ),
      attendees: _attendee_emails.map { |email| Google::Apis::CalendarV3::EventAttendee.new(email: email) },
      conference_data: {
        create_request: {
          request_id: 'random-request-id'
        }
      }
    )

    result = calendar_client.insert_event('primary', event)
  end
end
      

The error is:

calendar_client.insert_event('primary', event)
Google::Apis::ClientError: forbiddenForServiceAccounts: Service accounts cannot invite attendees without Domain-Wide Delegation of Authority.
from /Users/rabeyakhatunmuna/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/google-apis-core-0.11.0/lib/google/apis/core/http_command.rb:239:in `check_status'