By default, your theme favicon is restricted to your theme, so it isn’t present at your admin and login screen.
Fortunately, you can quickly add it with login_head and admin_head action:
function add_favicon() { $favicon_url = get_stylesheet_directory_uri() . '/assets/images/favicon/favicon-16x16.png'; echo '<link rel="shortcut icon" href="' . $favicon_url . '" />'; } add_action('login_head', 'add_favicon'); add_action('admin_head', 'add_favicon');