How can I use article’s feature Image for my notification?

To use the article feature image as a notification icon, enable the option “Use the post's featured image for the notification icon.”

However, there are certain conditions,

1. Your theme must support the feature image option. If it does not, then you must contact the theme author.

2. Another way to check is by looking into theme editor

Appearance-> Theme Editor, the

Find functions.php file & post-thumbnails. It may look something like this

Add_theme_support( ‘post-thumbnails’ );