Okay, I found the error! Damn, I missed it too! Ahahahah this is the code I had in functions.php file:

// was added
if( !function_exists('redirect_404_to_homepage') ){

    add_action( 'template_redirect', 'redirect_404_to_homepage' );

    function redirect_404_to_homepage(){
       if(is_404()):
            wp_safe_redirect( home_url('/') );
            exit;
        endif;
    }
}
// end was added

As soon as I deleted it, your plugin worked properly – but now I have to figure a code that would work (i.e. code that would re-direct to homepage instead of 404 page).

Thank you for your patience and help.

I can’t believe I missed that little snippet! Ahahahaha

Okay, only 3 days lost on creating this website, not bad, not good – just the way the cookie crumbles Ahahahah

Again, thanks!

Okay, sounds great! Thanks.