Conditional required field without the plugin

Hello,

I found this fab code on doing conditional required fields with a filter, without a plugin. However it is not working, and the form submits without the required fields. I am trying to make 2 fields required if a checkbox is checked, the “fromwho” and “friend-email”
fields named respectively. I have also been trying to follow this example from https://contactform7.com/2015/03/28/custom-validation/

add_filter( 'wpcf7_validate_text', 'my_conditional_required', 10, 2 );
add_filter( 'wpcf7_validate_text*', 'my_conditional_required', 10, 2 );
add_filter( 'wpcf7_validate_email', 'my_conditional_required', 10, 2 );
add_filter( 'wpcf7_validate_email*', 'my_conditional_required', 10, 2 );

function my_conditional_required($result, $tag) {
    $tag = new WPCF7_Shortcode( $tag );
    $name = $tag->name;

    $value = isset( $_POST[$name] )
        ? trim( wp_unslash( strtr( (string) $_POST[$name], "\n", " " ) ) )
        : '';
		
	if ( "fromwho" == $name && 'true' == $_POST['checkboxA'][0] ) :
        if ( '' == $value  ) :
            $result->invalidate( $tag, wpcf7_get_message( 'invalid_required' ) );
        endif;
    endif;
	
	if ( 'friend-email' == $name && 'true' == $_POST['checkboxA'][0] ) :
		if ( '' == $value ) :
			$result->invalidate( $tag, wpcf7_get_message( 'invalid_required' ) );
		endif;
	endif;

    return $result;
}

Any help appreciated!