Uppercase First Name, Last Name or User Login Name on LearnDash LMS Certificates

functions.php

add_filter( 'learndash_usermeta_shortcode_field_value_display', 'ee_learndash_usermeta_shortcode_field_value_display_callback', 10, 2 );
function ee_learndash_usermeta_shortcode_field_value_display_callback( $value, $attr ) {
	global $post;
	// Don't apply logic if not on a certificate
	if ( isset( $post->post_type ) ) {
		$is_certificate_page = $post->post_type;
		if ( 'sfwd-certificates' != $is_certificate_page ) {
			return $value;
		}
	}
	
	$user_name_fields = array( 'user_login', 'first_last_name', 'nickname', 'user_nicename', 'display_name', 'first_name', 'last_name' );
	if ( in_array( $attr['field'], $user_name_fields ) ) {
		return strtoupper( $value );
	}
	
	return $value;
}

Place this snippet in your child theme's functions.php file