async def post(self,body: Conversation, request_configuration: Optional[RequestConfiguration[QueryParameters]] = None) -> Optional[Conversation]:
        """
        Create an open extension (openTypeExtension object) and add custom properties in a new or existing instance of a resource. You can create an open extension in a resource instance and store custom data to it all in the same operation, except for specific resources. The table in the Permissions section lists the resources that support open extensions.
        param body: The request body
        param request_configuration: Configuration for the request such as headers, query parameters, and middleware options.
        Returns: Optional[Conversation]
        Find more info here: https://learn.microsoft.com/graph/api/opentypeextension-post-opentypeextension?view=graph-rest-1.0
        """
        if body is None:
            raise TypeError("body cannot be null.")
        request_info = self.to_post_request_information(
            body, 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.conversation import Conversation

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

        Create an open extension (openTypeExtension object) and add custom properties in a new or existing instance of a resource. You can create an open extension in a resource instance and store custom data to it all in the same operation, except for specific resources. The table in the Permissions section lists the resources that support open extensions.
        param body: The request body
        param request_configuration: Configuration for the request such as headers, query parameters, and middleware options.
        Returns: Optional[Conversation]
        Find more info here: https://learn.microsoft.com/graph/api/opentypeextension-post-opentypeextension?view=graph-rest-1.0
        
msgraph/generated/groups/item/conversations/conversations_request_builder.py