How to get the queried object and retirieve Advanced Custom Fields from a taxonomy term.
$queried_object = get_queried_object();
$taxonomy = $queried_object->taxonomy;
$term_id = $queried_object->term_id;
global $post;
// get current term
$terms = get_the_terms($post->ID, 'MY_TAX');
// get acf image field from term
$thumbnail = get_field('category_featured_image', $queried_object)