async def get(self,request_configuration: Optional[RequestConfiguration[InstalledAppsRequestBuilderGetQueryParameters]] = None) -> Optional[TeamsAppInstallationCollectionResponse]:
        """
        List all app installations within a chat.
        param request_configuration: Configuration for the request such as headers, query parameters, and middleware options.
        Returns: Optional[TeamsAppInstallationCollectionResponse]
        Find more info here: https://learn.microsoft.com/graph/api/chat-list-installedapps?view=graph-rest-1.0
        """
        request_info = self.to_get_request_information(
            request_configuration
        )
        from ....models.o_data_errors.o_data_error import ODataError

        error_mapping: dict[str, type[ParsableFactory]] = {
            "XXX": ODataError,
        }
        if not self.request_adapter:
            raise Exception("Http core is null") 
        from ....models.teams_app_installation_collection_response import TeamsAppInstallationCollectionResponse

        return await self.request_adapter.send_async(request_info, TeamsAppInstallationCollectionResponse, error_mapping)

        List all app installations within a chat.
        param request_configuration: Configuration for the request such as headers, query parameters, and middleware options.
        Returns: Optional[TeamsAppInstallationCollectionResponse]
        Find more info here: https://learn.microsoft.com/graph/api/chat-list-installedapps?view=graph-rest-1.0
        
msgraph/generated/chats/item/installed_apps/installed_apps_request_builder.py