Enym „Autobutton“ Shortcode

// Add Shortcode
function enym_autobutton( $atts ) {

// Attributes
$atts = shortcode_atts(
    array(
        'label' => '',
        'class' => '',
        'link'=>''  
    ),
    $atts
);

global $post;
//$terms = wp_get_post_terms( $atts['post_id'], $atts['taxonomy']);
//$term = get_term( '24', 'objektart' );
$terms = wp_get_post_terms( $post->ID, 'objektart' );
//print_r($terms);
$tax = $terms[0]->term_id;
$name = $terms[0]->name;

$link = '<a href="';
if ($tax == 23) { //Gewerbe
    $link .= 'mailto:ukaplan@kvb-hamburg.de?subject=Anfrage%20Gewerbe';        
    $label = 'Anfrage: '.$name; 
} else  if ($tax == 24) { //Wohnen
    $link .= 'mailto:pglamann@kvb-hamburg.de?subject=Anfrage%20Wohnen';    
    $label = 'Anfrage: '.$name; 
} else { //no tax
    $link .= '/kontakt';       
    $label = 'Jetzt anfragen'; 
    return;
}
$link .= '" class="autobutton vcex-button theme-txt-link align-right inline arrow-right arrow-blue"><span class="vcex-button-inner theme-button-inner">'.$label.'</span></a>'; 
return $link;

}
add_shortcode( 'autobutton', 'enym_autobutton' );