Wrong Tasklist ID from Google Tasks API

Question

Spent hours and cannot seem to understand what went wrong with my Google Tasks API.

1. Created new project in GCP
2. Enable Google Tasks API
3. Added a key and downloaded services-account.json
4. Using the official Google Client PHP library
5. Managed to authenticate and getting a response from Google Tasks API.

But it doesn't return the correct Google Tasks and Tasklist ID from my account.

The response returned the ID value which I validated with the Google Tasks API Resource - Try this API and the ID inputted resulted Invalid ID. Tried with the Try this API and authenticate my account and the Task ID is not the same with what I got from the Google Client PHP library.

Hoping someone can shed some lights. Thanks in advance.

public function google_test() {
    $client = new Google\Client();
    $token = plugin_dir_path( __FILE__ ) . 'credentials.json';
    $client->setApplicationName('Google Tasks API PHP Quickstart');
$client->setScopes(Google_Service_Tasks::TASKS_READONLY);
    $client->setAuthConfig( $token );

    // Get the API client and construct the service object.
    $service = new Google_Service_Tasks($client);

    // Print the first 10 task lists.
    $optParams = array(
      'maxResults' => 99,
    );
    $results = $service->tasklists->listTasklists($optParams);

    foreach ($results->getItems() as $tasklist) {
        $tasklist_id = $tasklist->getId();
        $tasks = $service->tasks->listTasks($tasklist_id, $optParams);
        $all_tasks[]        = $tasks->getItems();
}
    return $all_tasks;
}

Payload returned

O:30:"Google_Service_Tasks_TaskLists":10:{s:17:"��collection_key";s:5:"items";s:4:"etag";s:17:""LTE2NTQyOTQ1NDc"";s:12:"��itemsType";s:29:"Google_Service_Tasks_TaskList";s:16:"��itemsDataType";s:5:"array";s:4:"kind";s:15:"tasks#taskLists";s:13:"nextPageToken";N;s:25:"��internal_gapi_mappings";a:0:{}s:12:"��modelData";a:0:{}s:12:"��processed";a:0:{}s:5:"items";a:1:{i:0;O:29:"Google_Service_Tasks_TaskList":9:{s:4:"etag";s:16:""MTg1ODI2Mzc1MQ"";s:2:"id";s:32:"MTgxMDkzOTg1ODk3OTkzMTUxODI6MDow";s:4:"kind";s:14:"tasks#taskList";s:8:"selfLink";s:84:"https://www.googleapis.com/tasks/v1/users/@me/lists/MTgxMDkzOTg1ODk3OTkzMTUxODI6MDow";s:5:"title";s:8:"My Tasks";s:7:"updated";s:24:"2021-03-26T13:39:27.312Z";s:25:"��internal_gapi_mappings";a:0:{}s:12:"��modelData";a:0:{}s:12:"�*�processed";a:0:{}}}}

Google Tasks API Explorer

{ "kind": "tasks#taskLists", "etag": ""LTExMDA5MDAxOQ"", "items": [ { "kind": "tasks#taskList", "id": "MDgyMDgxNjM3NzQxMDkxMjA0Mzk6MDow", "etag": ""MTg1NTU3NTU1OQ"", "title": "My Tasks", "updated": "2021-03-26T12:54:38.480Z", "selfLink": "https://www.googleapis.com/tasks/v1/users/@me/lists/MDgyMDgxNjM3NzQxMDkxMjA0Mzk6MDow" }, { "kind": "tasks#taskList", "id": "SldJSG1BUU53RjFmRkRlMg", "etag": ""MTg0NDkwMTM4Nw"", "title": "Jazlyn's Tasks", "updated": "2021-03-26T09:56:44.308Z", "selfLink": "https://www.googleapis.com/tasks/v1/users/@me/lists/SldJSG1BUU53RjFmRkRlMg" }, { "kind": "tasks#taskList", "id": "Y1JNZUtBUDJXb1psMk5WNg", "etag": ""LTIzMTA5MjU2MQ"", "title": "Anneke's Tasks", "updated": "2021-03-02T09:16:51.047Z", "selfLink": "https://www.googleapis.com/tasks/v1/users/@me/lists/Y1JNZUtBUDJXb1psMk5WNg" }, { "kind": "tasks#taskList", "id": "M0ozM2VjekRWdDBYaHVuMA", "etag": ""MzY4Njg4NTM2"", "title": "Richard's Tasks", "updated": "2021-03-09T07:53:11.425Z", "selfLink": "https://www.googleapis.com/tasks/v1/users/@me/lists/M0ozM2VjekRWdDBYaHVuMA" }, { "kind": "tasks#taskList", "id": "NjlpcFpUVm5iYy02M2o1Sg", "etag": ""MTQxNzA5OTA3Nw"", "title": "Calvin's Tasks", "updated": "2021-03-21T11:06:42.142Z", "selfLink": "https://www.googleapis.com/tasks/v1/users/@me/lists/NjlpcFpUVm5iYy02M2o1Sg" }, { "kind": "tasks#taskList", "id": "c184LVhIZXB3N0Zva1Jndg", "etag": ""MTg1NTg0MDAzNg"", "title": "Test", "updated": "2021-03-26T12:59:03.165Z", "selfLink": "https://www.googleapis.com/tasks/v1/users/@me/lists/c184LVhIZXB3N0Zva1Jndg" } ] }