[Python] OAuth Card [No dialogs] does not work in MS Teams client. Works in Emulator and...

What i am trying to do?


I am trying to display a OAuth Card to the user to sign in, and fetch the access JWT token so that i can use it to impersonate him/her in my Teams Bot. The App configurations and the Bot have been configured as per the following link exactly.

https://learn.microsoft.com/en-us/m.../add-authentication?tabs=python,python-sample

Current State


I am not using the Dialogs feature of the SDK, rather, i send the OAuth card directly like the following.

async def dispatch_signin_card(self, turn_context):
oauth_card = OAuthCard(
text="Sign in to continue",
connection_name=self.connection_name,
buttons=[
CardAction(
type=ActionTypes.signin,
title="Sign in"
)
]
)

await turn_context.send_activity(
Activity(attachments=[CardFactory.oauth_card(oauth_card)]))


Everytime there is a message (on_message_activity) i check if the turn_context object has a token to make a decision of sending a new signin card. like the following

async def get_token(self, turn_context: TurnContext):
# Try to get the token from the token exchange or from a prior sign-in
token_response = None

# Check if the activity contains a token response
if turn_context.activity.value and "token" in turn_context.activity.value:
token_response = TokenResponse(token=turn_context.activity.value["token"])

if not token_response:
# If no token in the activity, try to retrieve it from the OAuth connection
token_response = await turn_context.adapter.get_user_token(turn_context, self.connection_name)

return token_response


The Card functions perfectly in the Emulator as shown below and in the web chat from the Azure Bot Interface.



It does not work in Teams, neither in the Desktop Client or the Web Client. It gives me the following error.



What have i tried already

• I have tried adding *.botframwework.com, token.botframework.com, my ngrok instance url, and graph.microsoft.com to the valid Domains list, as i read them on various support articles.
• I have tried triple checking my App Registrations, and their configurations if they have been configured correctly.
• I have tried mannually generating the signin link, but cannot decipher how to the OAuth link is generated. I have noticed that everytime a new link is generated, it takes the form https://token.botframework.com/api/oauth/signin?signin=some_ids
• I have also read many posts which talk about waiting for a bit (4 Hours), before the changes to an App Manifest are actually reflected on Teams. (Not the problem unfortunately).
• I tried inspecting traffic on my ngrok instance, when i click the signin button from teams. There is no activity whatsoever.

I am good with honestly any more directions for my investigation. I ran out of ideas and thought of posting a question here (in hopes of not having it marked as duplicate), to help me solve this error.

BTW, i use the package botbuilder-integration-aiohttp==4.15.0.

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