Can’t display user bio

I’m not certain as I have no experience of ACADP, but I suspect your problem is the function, acadp_get_user_slug. What does it do? Likely not what you think! As the following will work for the user admim:

function display_user_bio() {
    $user_slug = 'admin';
    if($user_slug != '') {
        $user = get_user_by('login', $user_slug);
        if($user) {
            return get_the_author_meta('description', $user->ID);
        }
    }
}
add_shortcode('user_bio', 'display_user_bio');

Note the change to return the required output, not echo it. WP shortcodes should return their output. 😉

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