Please note that enabling WP_DEBUG will cause all PHP errors, notices and warnings to be displayed. This is likely to modify the default behavior of PHP which only displays fatal errors and/or shows a white screen of death when errors are reached.
Please note that it won't show anything unless there is a PHP error, notice or warning when running WordPress, are you running into any issue with WordPress that is not shown as error when you enable WP_DEBUG? Is there any way we can reproduce that error?
You can also modify the display_errors option in PHP
display_errors = On
and restart the services later
sudo /opt/bitnami/ctlscript.sh restart
We also suggest you ask in the official forums of the application to get more information about how to show the debug messages in WordPress.