[Python] Failure to authenticate a SharePoint connection with AuthenticationContext

I have the following python code in my Matillion PythonScript component:

from office365.sharepoint.client_context import ClientContext
from office365.runtime.auth.authentication_context import AuthenticationContext
authority_url = “https://login.microsoftonline.us/<tenant_id>”

site_url = “https://mysite.sharepoint.us/sites/myfolder”
auth_ctx = AuthenticationContext(authority_url)

if auth_ctx.acquire_token_for_app(client_id, client_secret):
ctx = ClientContext(site_url, auth_ctx)
web = ctx.web
ctx.load(web)
ctx.execute_query()

print("Web Title:", web.properties["Title"])
else:
raise ValueError(“Failed to acquire token for the given client credentials.”)



It errors out at ctx.execute_query() with the following error message

ValueError: {“error”:“invalid_request”,“error_description”:"AADSTS900023: Specified tenant identifier ‘none’ is neither a valid DNS name, nor a valid external domain.

Is there a way to trouble shoot the cause of this error, since the error message is not very informative?

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