Azure Communication Services Chat add MicrosoftTeamsUserIdentifier fails

I am trying to build a proof of concept chat app that allows our internal Teams users to join an Azure Communication Services Chat thread. 

I have managed to convert the Azure AD token to a Communication Services Token using
identity_client.get_token_for_teams_user()  in Python. 

I then create a MicrosoftTeamsUserIdentifier object using the 'oid' attribute from the Azure account. 

But when I attempt to add this user to the thread using 'chat_client_thread.add_participants()
it errors out with 403 permissions check failed. 
the underlying call to the communication services add api succeeds with a 201 response code. 
but after that it somehow gets converted to a 403 response. 

Then after that it errors again because the underlying code is expecting all Communication Identifiers to contain an 'id' field and MicrosoftTeamsUserIdentifier does not contain that field. 

This is the final error I see at the top level.

File "******/chat-server-poc/.venv/lib/python3.10/site-packages/azure/communication/chat/_utils.py", line 53, in create_dict
    result[participant.identifier.properties['id']] = participant
KeyError: 'id'

Looking for guidance or example code.

Thanks.