How to create a shortcode to list all tags on a page

Hello community,

I’m trying to output all the tags on a page, but for some reason it does not work.

Docs: get_tags and add_shortcode

Code for functions.php:

function get_all_tags($atts, $content = null ) {
	$tags = get_tags();
	$html = '<div class="post_tags">';
	foreach ( $tags as $tag ) {
		$tag_link = get_tag_link( $tag->term_id );
		
		$html .= "<a href='{$tag_link}' title='{$tag->name} Tag' class='{$tag->slug}'>";
		$html .= "{$tag->name}({$tag->count})</a>";
	}
	$html .= '</div>';
	return $html;
}
add_shortcode('alltags', 'get_all_tags');

It looks simple, but for some reason I still miss something. Does someone have an idea or a hint for me?

Thanks a lot!