Why I sometime can`t delete subscriptions with youtube API V3? - youtube-api

Question

I cannot remove some subscriptions from my list of subscriptions using youtube API V3 in PHP.
I run "check whether a subscription exists":
And I got answer:
**
* API response
*/
{
"kind": "youtube#subscriptionListResponse",
"etag": "\"XpPGQXPnxQJhLgs6enD_n8JR4Qk/vQg5vcdf3VcnZjlUVNARSwXX8tU\"",
"pageInfo": {
"totalResults": 1,
"resultsPerPage": 5
},
"items": [
{
"kind": "youtube#subscription",
"etag": "\"XpPGQXPnxQJhLgs6enD_n8JR4Qk/hMElmhRjuEbIkTVsj4iZTctj0jg\"",
"id": "lS7ClBpiilG9lCqFDoFRAmEypiwUQCact4W5ovUdXDE",
"snippet": {
"publishedAt": "2018-11-24T15:48:13.369Z",
"title": "Melieca and Kids",
After that i try delete subscription with ID "lS7ClBpiilG9lCqFDoFRAmEypiwUQCact4W5ovUdXDE"
function subscriptionsDelete($service, $id, $params) {
$params = array_filter($params);
$response = $service->subscriptions->delete(
$id,
$params
);
print_r($response);
}
subscriptionsDelete($service,
'lS7ClBpiilG9lCqFDoFRAmEypiwUQCact4W5ovUdXDE', array());
Response from youtube next:
{
"error": {
"errors": [
{
"domain": "youtube.subscription",
"reason": "subscriptionNotFound",
"message": "The subscription that you are trying to delete cannot be found. Check the value of the requests id parameter to ensure that it is correct."
}
],
"code": 404,
"message": "The subscription that you are trying to delete cannot be found. Check the value of the requests id parameter to ensure that it is correct."
}
}