When querying users with WP_User_Query by meta_value like '23432' (as string or integer) it returns nothing. If searched by text like 'admin' it returns all users where meta_value equals 'admin'.
$user_query = new WP_User_Query(
array(
'number' => 1,
'meta_query' => array(
array(
'key' => 'customer_id',
'value' => '23432',
'compare' => 'LIKE'
)
)
)
);
$users = $user_query->get_results();
The meta_value = '23432' is in the wp_usermeta table at meta_key = 'customer_id' and by search in MySQL it returns the right entry.