Add meta your meta field to the allowed values of the REST API orderby parameter

function.php

$post_type ="wf_account";
// Add meta your meta field to the allowed values of the REST API orderby parameter
add_filter(
    'rest_' . $post_type . '_collection_params',
    function( $params ) {
		 $fields = ["first_name","last_name","address","email"];
		foreach ($fields as $key => $value) {
			$params['orderby']['enum'][] = $value;
		}
        return $params;
    },
    10,
    1
);