Google Cloud Storage with Django getting 403 - django

Question

Hi I have Django web page and I am migrating to GCloud. I have successfully migrated the DB and now I am trying to migrate the Static and Media storages.
I have this in my settings:
INSTALLED_APPS.append('storages')
GS_ACCESS_KEY_ID = env('GS_ACCESS_KEY_ID')
GS_SECRET_ACCESS_KEY = env('GS_SECRET_ACCESS_KEY')
GS_BUCKET_NAME = env('GS_BUCKET_NAME')
from storages.backends.gs import GSBotoStorage
StaticGStorage = lambda: GSBotoStorage(location='static')
MediaGStorage = lambda: GSBotoStorage(location='media')
MEDIA_URL = 'https://storage.googleapis.com/{}/media/'.format(GS_BUCKET_NAME)
STATIC_URL = 'https://storage.googleapis.com/{}/static/'.format(GS_BUCKET_NAME)
DEFAULT_FILE_STORAGE = 'config.settings.local.MediaGStorage'
STATICFILES_STORAGE = 'config.settings.local.StaticGStorage'
I followed this: Configure Django and Google Cloud Storage?
In Access key env variables are values from "Interoperability" tab in Settings in GCloud Storage and I am 100% sure that they are loaded correctly. Also the bucket name is correct.
But I am still getting this exception:
Traceback (most recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/usr/local/lib/python3.5/site-packages/django/core/management/__init__.py", line 367, in execute_from_command_line
utility.execute()
File "/usr/local/lib/python3.5/site-packages/django/core/management/__init__.py", line 359, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/usr/local/lib/python3.5/site-packages/django/core/management/base.py", line 294, in run_from_argv
self.execute(*args, **cmd_options)
File "/usr/local/lib/python3.5/site-packages/django/core/management/base.py", line 345, in execute
output = self.handle(*args, **options)
File "/usr/local/lib/python3.5/site-packages/django/contrib/staticfiles/management/commands/collectstatic.py", line 193, in handle
collected = self.collect()
File "/usr/local/lib/python3.5/site-packages/django/contrib/staticfiles/management/commands/collectstatic.py", line 124, in collect
handler(path, prefixed_path, storage)
File "/usr/local/lib/python3.5/site-packages/django/contrib/staticfiles/management/commands/collectstatic.py", line 349, in copy_file
if not self.delete_file(path, prefixed_path, source_storage):
File "/usr/local/lib/python3.5/site-packages/django/contrib/staticfiles/management/commands/collectstatic.py", line 255, in delete_file
if self.storage.exists(prefixed_path):
File "/usr/local/lib/python3.5/site-packages/storages/backends/s3boto.py", line 454, in exists
return k.exists()
File "/usr/local/lib/python3.5/site-packages/boto/s3/key.py", line 539, in exists
return bool(self.bucket.lookup(self.name, headers=headers))
File "/usr/local/lib/python3.5/site-packages/boto/s3/bucket.py", line 143, in lookup
return self.get_key(key_name, headers=headers)
File "/usr/local/lib/python3.5/site-packages/boto/gs/bucket.py", line 111, in get_key
query_args_l=query_args_l)
File "/usr/local/lib/python3.5/site-packages/boto/s3/bucket.py", line 231, in _get_key_internal
response.status, response.reason, '')
boto.exception.GSResponseError: GSResponseError: 403 Access denied to 'gs://my-bucket-name/static/css/material.grey-orange.min.css'.
I get this exception from command:
python manage.py collectstatic --noinput
I should probably set something in the GCloud console but I have no idea what is wrong.
Thanks for help