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python - GAE AttributeError: 'Credentials' object has no attribute 'with_subject'

I have a python app I want to deploy on App Engine (2nd Generation Python 3.7) on which I use a Service Account with Domain-wide delegation enabled to access user data.

Locally I do:

import google.auth
from apiclient.discovery import build

creds, project = google.auth.default(
    scopes=['https://www.googleapis.com/auth/admin.directory.user', ],
)
creds = creds.with_subject(GSUITE_ADMIN_USER)

service = build('admin', 'directory_v1', credentials=creds)

This works good and, as far as I know it is the current way to do this when using Application Default Credentials (locally I have GOOGLE_APPLICATION_CREDENTIALS defined).

Problem is on GAE, when deployed, the call to with_subject raises: AttributeError: 'Credentials' object has no attribute 'with_subject'

I have enabled Domain-wide delegation on the GAE service account already.

What is different between the GOOGLE_APPLICATION_CREDENTIALS I use locally and the ones in GAE when both are service accounts with domain-wide delegation?

Where is .with_subject() on GAE?

The creds object received is of type compute_engine.credentials.Credentials.

Full traceback:

Traceback (most recent call last):
  File "/env/lib/python3.7/site-packages/gunicorn/arbiter.py", line 583, in spawn_worker
    worker.init_process()
  File "/env/lib/python3.7/site-packages/gunicorn/workers/gthread.py", line 104, in init_process
    super(ThreadWorker, self).init_process()
  File "/env/lib/python3.7/site-packages/gunicorn/workers/base.py", line 129, in init_process
    self.load_wsgi()
  File "/env/lib/python3.7/site-packages/gunicorn/workers/base.py", line 138, in load_wsgi
    self.wsgi = self.app.wsgi()
  File "/env/lib/python3.7/site-packages/gunicorn/app/base.py", line 67, in wsgi
    self.callable = self.load()
  File "/env/lib/python3.7/site-packages/gunicorn/app/wsgiapp.py", line 52, in load
    return self.load_wsgiapp()
  File "/env/lib/python3.7/site-packages/gunicorn/app/wsgiapp.py", line 41, in load_wsgiapp
    return util.import_app(self.app_uri)
  File "/env/lib/python3.7/site-packages/gunicorn/util.py", line 350, in import_app
    __import__(module)
  File "/srv/main.py", line 1, in <module>
    from config.wsgi import application
  File "/srv/config/wsgi.py", line 38, in <module>
    call_command('gsuite_sync_users')
  File "/env/lib/python3.7/site-packages/django/core/management/__init__.py", line 148, in call_command
    return command.execute(*args, **defaults)
  File "/env/lib/python3.7/site-packages/django/core/management/base.py", line 353, in execute
    output = self.handle(*args, **options)
  File "/srv/metanube_i4/users/management/commands/gsuite_sync_users.py", line 14, in handle
    gsuite_sync_users()
  File "/env/lib/python3.7/site-packages/celery/local.py", line 191, in __call__
    return self._get_current_object()(*a, **kw)
  File "/env/lib/python3.7/site-packages/celery/app/task.py", line 375, in __call__
    return self.run(*args, **kwargs)
  File "/srv/metanube_i4/users/tasks.py", line 22, in gsuite_sync_users
    creds = creds.with_subject(settings.GSUITE_ADMIN_USER)
AttributeError: 'Credentials' object has no attribute 'with_subject'"  

Packages (partial list):

google-api-core==1.5.0
google-api-python-client==1.7.4
google-auth==1.5.1
google-auth-httplib2==0.0.3
google-cloud-bigquery==1.6.0
google-cloud-core==0.28.1
google-cloud-logging==1.8.0
google-cloud-storage==1.13.0
google-resumable-media==0.3.1
googleapis-common-protos==1.5.3
httplib2==0.11.3
oauthlib==2.1.0
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