async def get(self,request_configuration: Optional[RequestConfiguration[QueryParameters]] = None) -> Optional[OnAuthenticationMethodLoadStartExternalUsersSelfServiceSignUp]:
        """
        Get the item of type microsoft.graph.onAuthenticationMethodLoadStartHandler as microsoft.graph.onAuthenticationMethodLoadStartExternalUsersSelfServiceSignUp
        param request_configuration: Configuration for the request such as headers, query parameters, and middleware options.
        Returns: Optional[OnAuthenticationMethodLoadStartExternalUsersSelfServiceSignUp]
        """
        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.on_authentication_method_load_start_external_users_self_service_sign_up import OnAuthenticationMethodLoadStartExternalUsersSelfServiceSignUp

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

        Get the item of type microsoft.graph.onAuthenticationMethodLoadStartHandler as microsoft.graph.onAuthenticationMethodLoadStartExternalUsersSelfServiceSignUp
        param request_configuration: Configuration for the request such as headers, query parameters, and middleware options.
        Returns: Optional[OnAuthenticationMethodLoadStartExternalUsersSelfServiceSignUp]
        
msgraph/generated/identity/authentication_events_flows/item/graph_external_users_self_service_sign_up_events_flow/on_authentication_method_load_start/graph_on_authentication_method_load_start_external_users_self_service_sign_up/graph_on_authentication_method_load_start_external_users_self_service_sign_up_request_builder.py