User query – getting values for custom meta keys/fields

SOLVED.
I missed ID field in field array.

$args = array(
    'role'           => 'author',
    'order'          => 'DESC',
    'orderby'        => 'post_count',
    'meta_query'     => array(
        'relation' => 'OR',
        array(
            'key'     => 'medical_diagnosis',
            'compare' => 'EXISTS',
        ),
        array(
            'key'     ='gender',
            'compare' => 'EXISTS',
        ),
    ),
    'who'            => 'authors',
    'count_total'    => true,
    'fields'         => array( 'ID', 'user_email', 'display_name'),
);

// The User Query
$users_query = new WP_User_Query( $args );

// The User Loop
if ( ! empty( $users_query->get_results() ) ) {
    foreach ( $users_query->get_results() as $user ) {
        // do something
        
        // get all user meta at once:
        $meta_for_user = get_user_meta( $user->ID);
        
    $out="<p>users list</p>". $user->user_email . '<br />'. $user->display_name . $meta_for_user['medical_diagnosis'][0] . '<br />' . $meta_for_user['gender'][0] . '<br />'. $user->ID . $meta_for_user['last_name'][0] .  '<br />';
    return $out;
    
    }
} else {
    echo 'no users found';
}
    
} );