This seems like it would be a really nice plugin if the author would maintain/fix it. I am NOT a coder, but I waded into this because I really think this sort of validation is valuable.
I found the comment by aswitahidayat to be correct. There was no message in the code for invalid_confirm_email. Digging back into a much older support thread, I found this:
add_filter( 'wpcf7_messages', 'confirm_email_messages');
function confirm_email_messages($messages) {
$messages['invalid_confirm_email'] = array(
'description' => __('The email addresses do not match.'),
'default' => __('The email addresses do not match.'),
);
return $messages;
}
After some fiddling around, I determined where to insert the “add_filter…” and “function…” pieces. Plugin seems to work now. What I don’t understand is why the author says he fixed this some 8 months ago, but the above fix is not in the plugin I installed today. I’m going to give this plugin a 2-star rating in hopes the author will respond and get it right for others to use.