iamshwin opened a new issue #8163: Google `Credentials` object has not attribute `with_subject` URL: https://github.com/apache/airflow/issues/8163 **Apache Airflow version**: master **What happened**: When`delegate_to` is supplied and no `key_path` or `keyfile_dict` is supplied (i.e. `google.auth.default()` is called) the `Credentials` object has no attribute `with_subject`. This is called in `get_credentials_and_project_id` in https://github.com/apache/airflow/blob/master/airflow/providers/google/cloud/utils/credentials_provider.py `AttributeError: 'Credentials' object has no attribute 'with_subject'` **What you expected to happen**: Correct authentication, or raise an Exception that you shouldn't be supplying a `delegate_to` when you haven't supplied a `key_path` or `keyfile_dict`. **How to reproduce it**: Supply a `delegate_to` argument in the Operator, but do not supply a `key_path` or `keyfile_dict`.
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