How can I install TeamsApps to chat

[Keisuke Ueda (kueda9321)]

Hi,

I'd like to install Teams Apps to chat using the Graph API. Following the documentation, I implemented the code as shown below:

async def add_app_to_chat(client, app_id, chat_id):
    request_body = TeamsAppInstallation(
        consented_permission_set=TeamsAppPermissionSet(
            resource_specific_permissions=[
                TeamsAppResourceSpecificPermission(
                    permission_value="OnlineMeeting.ReadBasic.Chat",
                    permission_type=TeamsAppResourceSpecificPermissionType.Delegated,
                ),
                TeamsAppResourceSpecificPermission(
                    permission_value="ChannelMeeting.ReadBasic.Group",
                    permission_type=TeamsAppResourceSpecificPermissionType.Delegated,
                ),
                TeamsAppResourceSpecificPermission(
                    permission_value="OnlineMeetingParticipant.Read.Chat",
                    permission_type=TeamsAppResourceSpecificPermissionType.Application,
                ),
                TeamsAppResourceSpecificPermission(
                    permission_value="OnlineMeetingNotification.Send.Chat",
                    permission_type=TeamsAppResourceSpecificPermissionType.Application,
                ),
            ],
            additional_data={
                "teams_app@odata_bind": f"https://graph.microsoft.com/v1.0/appCatalogs/teamsApps/{app_id}",
            },
        ),
    )
    result = await client.chats.by_chat_id(chat_id).installed_apps.post(request_body)

This code triggered the following API Error:

msgraph.generated.models.o_data_errors.o_data_error.ODataError: 
        APIError
        Code: 400
        message: None
        error: MainError(additional_data={}, code='BadRequest', details=None, inner_error=InnerError(additional_data={}, client_request_id='9e4e9f64-aba1-4c0e-9da8-a9f14aedf3e7', date=datetime.datetime(2025, 5, 9, 11, 56, 52), odata_type=None, request_id='c7e7f184-b8be-4f3f-a76b-a499cc8f36cb'), message='The navigation bind for the teamsApp was missing in request.', target=None)
When only passing body with additional_data (i.e. exclude consented_permission_set), the same error occurred.

When I tried passing a body with only additional_data (i.e., excluding consented_permission_set), the same error occurred.

For further investigation, I tried using this API via Graph Explorer and faced two problems:

When posting a body with only teamsApp@odata.bind, I received a Bad Request - 400: ResourceSpecificPermissionsMismatch.
I believe this is an expected error because the app I want to install requires resource-specific consent.

Next, when I added consentedPermissionSet to the body (similar to my Python code), I received a Bad Gateway - 502: Failed to execute backend request.

I've tried multiple approaches both in Python and Graph Explorer, but I can't successfully install the app to the chat. How can I resolve this issue?