mik-laj edited a comment on issue #8163: Google `Credentials` object has not attribute `with_subject` URL: https://github.com/apache/airflow/issues/8163#issuecomment-610011525 Cloud Composer uses credentials from the metadata server in the client project and credentials from App Engine in the tenant project (webserver). In the case of metadata server I am sure that delegate cannot be done because the JWT token is not generated. The access token is read from the URL. http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/default/token using GET. method
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