Twitter REST v1 API – Tweepy -Python – Authentication – Twitter API

I have a simple Python app with Tweepy to upload image to Twitter.
This feature is available only with V1 API.
The access to V1 API is possible either with Standalone App or with Elevated Privileges.

I did both of them but I constantly receive 403 Forbidden error.

Here is my simple code:

client_v1 = tweepy.API(auth=auth)
upload_file_media = client_v1.media_upload(
    filename="my_image.jpg"
)

This, I tried with all 3 possible authentication methods:

auth = tweepy.OAuth2AppHandler
auth = tweepy.OAuth2BearerHandler
auth = tweepy.OAuth1UserHandler

None of them worked.

Here is the stacktrace:

  File "/opt/anaconda3/envs/tf/lib/python3.7/site-packages/tweepy/api.py", line 3411, in media_upload
    additional_owners=additional_owners, **kwargs
  File "/opt/anaconda3/envs/tf/lib/python3.7/site-packages/tweepy/api.py", line 46, in wrapper
    return method(*args, **kwargs)
  File "/opt/anaconda3/envs/tf/lib/python3.7/site-packages/tweepy/api.py", line 3455, in simple_upload
    upload_api=True, **kwargs
  File "/opt/anaconda3/envs/tf/lib/python3.7/site-packages/tweepy/api.py", line 259, in request
    raise Forbidden(resp)
tweepy.errors.Forbidden: 403 Forbidden

Any idea what could be the reason?

Thanks a lot.