Wordpress Debugging & PHP/htaccess Config

I added this to wp-config.php:

define( 'WP_DEBUG', true );
define( 'WP_DEBUG_DISPLAY', true );
@ini_set( 'display_errors', 0 );
define( 'WP_DEBUG_LOG', true );

But I haven’t been able to produce an error in the httpd log or within /wp-content nor does it display in browser. What is the best way to enable debugging here? Thanks.

It would be logged to siteXX/fst/var/log/php-fpm/POOL.log. What’s the error specifically?