YouTubeAPIとPHPを利用して動画を一度アップロードした際に、二度目以降からエラーが表示される

前提・実現したいこと

PHPとYouTubeAPI_v3を利用した動画投稿フォームを作成しようとしています。
機能自体はテストを行い、問題なく目的のYOUTUBEアカウントに投稿を行えましたが、その後同じ手順で再度動画投稿を試みた際には、以下のエラー文が表示されました。

エラー文の内容によると、おそらく割り当て上限に達したのだと思うのですが、一度きりのアップロードをテストで行っただけですので、本当に上限に達したとは考えづらいかと思います。。。
何か他に考えられる要因がないかどうかお力添えいただきたく思います。

発生している問題・エラーメッセージ

Failed to start the resumable upload (HTTP 403: youtube.quota, The request cannot be completed because you have exceeded your <a href="/youtube/v3/getting-started#quota">quota</a>.)

試したこと

キャッシュの削除やサーバ内の/VIDEOSファイルの中身の消去、DB内のレコードの消去も一通り行いましたが、以前エラーが治りません。

補足情報（FW/ツールのバージョンなど）

php5.6
YouTubeAPI_v3
利用ソース参考：https://www.codexworld.com/upload-video-to-youtube-using-php/

php
1```upload.php
2<?php
3// Include api config file
4require_once 'config.php';
5
6// Include database class
7require_once 'DB.class.php';
8
9// Create an object of database class
10$db = new DB;
11
12// If the form is submitted
13if(isset($_POST['videoSubmit'])){
14    // Video info
15    $title = $_POST['title'];
16    $desc = $_POST['description'];
17    $tags = $_POST['tags'];
18    $privacy = !empty($_POST['privacy'])?$_POST['privacy']:'public';
19    
20    // Check whether file field is not empty
21    if($_FILES["file"]["name"] != ''){
22        // File upload path
23        $fileName = str_shuffle('codexworld').'-'.basename($_FILES["file"]["name"]);
24        $filePath = "videos/".$fileName;
25        
26        // Check the file type
27        $allowedTypeArr = array("video/mp4", "video/avi", "video/mpeg", "video/mpg", "video/mov", "video/wmv", "video/rm");
28        if(in_array($_FILES['file']['type'], $allowedTypeArr)){
29            // Upload file to local server
30            if(move_uploaded_file($_FILES['file']['tmp_name'], $filePath)){
31                // Insert video data in the database
32                $vdata = array(
33                    'title' => $title,
34                    'description' => $desc,
35                    'tags' => $tags,
36                    'privacy' => $privacy,
37                    'file_name' => $fileName
38                );
39                $insert = $db->insert($vdata);
40                
41                // Store db row id in the session
42                $_SESSION['uploadedFileId'] = $insert;
43            }else{
44                header("Location:","https://powerb.co.jp/test/maika/fileup_v2/index.php?err=ue");
45                exit;
46            }
47        }else{
48            header("Location:","https://powerb.co.jp/test/maika/fileup_v2/index.php?err=fe");
49            exit;
50        }
51    }else{
52        header('Location:','https://powerb.co.jp/test/maika/fileup_v2/index.php?err=bf');
53        exit;
54    }
55}
56
57// Get uploaded video data from database
58$videoData = $db->getRow($_SESSION['uploadedFileId']);
59
60// Check if an auth token exists for the required scopes
61$tokenSessionKey = 'token-' . $client->prepareScopes();
62if (isset($_GET['code'])) {
63  if (strval($_SESSION['state']) !== strval($_GET['state'])) {
64    die('The session state did not match.');
65  }
66
67  $client->authenticate($_GET['code']);
68  $_SESSION[$tokenSessionKey] = $client->getAccessToken();
69  header('Location: ' . REDIRECT_URL);
70}
71
72if (isset($_SESSION[$tokenSessionKey])) {
73  $client->setAccessToken($_SESSION[$tokenSessionKey]);
74}
75
76// Check to ensure that the access token was successfully acquired.
77if ($client->getAccessToken()) {
78  $htmlBody = '';
79  try{
80    // REPLACE this value with the path to the file you are uploading.
81    $videoPath = 'videos/'.$videoData['file_name'];
82    
83    if(!empty($videoData['youtube_video_id'])){
84        // Uploaded video data
85        $videoTitle = $videoData['title'];
86        $videoDesc = $videoData['description'];
87        $videoTags = $videoData['tags'];
88        $videoId = $videoData['youtube_video_id'];
89    }else{
90        // Create a snippet with title, description, tags and category ID
91        // Create an asset resource and set its snippet metadata and type.
92        // This example sets the video's title, description, keyword tags, and
93        // video category.
94        $snippet = new Google_Service_YouTube_VideoSnippet();
95        $snippet->setTitle($videoData['title']);
96        $snippet->setDescription($videoData['description']);
97        $snippet->setTags(explode(",", $videoData['tags']));
98    
99        // Numeric video category. See
100        // https://developers.google.com/youtube/v3/docs/videoCategories/list
101        $snippet->setCategoryId("22");
102    
103        // Set the video's status to "public". Valid statuses are "public",
104        // "private" and "unlisted".
105        $status = new Google_Service_YouTube_VideoStatus();
106        $status->privacyStatus = $videoData['privacy'];
107    
108        // Associate the snippet and status objects with a new video resource.
109        $video = new Google_Service_YouTube_Video();
110        $video->setSnippet($snippet);
111        $video->setStatus($status);
112    
113        // Specify the size of each chunk of data, in bytes. Set a higher value for
114        // reliable connection as fewer chunks lead to faster uploads. Set a lower
115        // value for better recovery on less reliable connections.
116        $chunkSizeBytes = 1 * 1024 * 1024;
117    
118        // Setting the defer flag to true tells the client to return a request which can be called
119        // with ->execute(); instead of making the API call immediately.
120        $client->setDefer(true);
121    
122        // Create a request for the API's videos.insert method to create and upload the video.
123        $insertRequest = $youtube->videos->insert("status,snippet", $video);
124    
125        // Create a MediaFileUpload object for resumable uploads.
126        $media = new Google_Http_MediaFileUpload(
127            $client,
128            $insertRequest,
129            'video/*',
130            null,
131            true,
132            $chunkSizeBytes
133        );
134        $media->setFileSize(filesize($videoPath));
135    
136    
137        // Read the media file and upload it chunk by chunk.
138        $status = false;
139        $handle = fopen($videoPath, "rb");
140        while (!$status && !feof($handle)) {
141          $chunk = fread($handle, $chunkSizeBytes);
142          $status = $media->nextChunk($chunk);
143        }
144        fclose($handle);
145    
146        // If you want to make other calls after the file upload, set setDefer back to false
147        $client->setDefer(false);
148        
149        // Update youtube video id to database
150        $db->update($videoData['id'], $status['id']);
151        
152        // Delete video file from local server
153        @unlink("videos/".$videoData['file_name']);
154        
155        // uploaded video data
156        $videoTitle = $status['snippet']['title'];
157        $videoDesc = $status['snippet']['description'];
158        $videoTags = implode(",",$status['snippet']['tags']);
159        $videoId = $status['id'];
160    }
161    
162    // uploaded video embed html
163    $youtubeURL = 'https://youtu.be/'.$videoId;
164    $htmlBody .= "<p class='succ-msg'>Video Uploaded to YouTube</p>";
165    $htmlBody .= '<embed width="400" height="315" src="https://www.youtube.com/embed/'.$videoId.'"></embed>';
166    $htmlBody .= '<ul><li><b>YouTube URL: </b><a href="'.$youtubeURL.'">'.$youtubeURL.'</a></li>';
167    $htmlBody .= '<li><b>Title: </b>'.$videoTitle.'</li>';
168    $htmlBody .= '<li><b>Description: </b>'.$videoDesc.'</li>';
169    $htmlBody .= '<li><b>Tags: </b>'.$videoTags.'</li></ul>';
170    $htmlBody .= '<a href="logout.php">Logout</a>';
171
172  } catch (Google_Service_Exception $e) {
173    $htmlBody .= sprintf('<p>A service error occurred: <code>%s</code></p>',
174        htmlspecialchars($e->getMessage()));
175  } catch (Google_Exception $e) {
176    $htmlBody .= sprintf('<p>An client error occurred: <code>%s</code></p>',
177        htmlspecialchars($e->getMessage()));
178    $htmlBody .= 'Please reset session <a href="logout.php">Logout</a>';
179  }
180
181  $_SESSION[$tokenSessionKey] = $client->getAccessToken();
182} elseif (OAUTH_CLIENT_ID == '') {
183  $htmlBody = <<<END
184  <h3>Client Credentials Required</h3>
185  <p>
186    You need to set <code>$oauthClientID</code> and
187    <code>$oauthClientSecret</code> before proceeding.
188  <p>
189END;
190} else {
191  // If the user hasn't authorized the app, initiate the OAuth flow
192  $state = mt_rand();
193  $client->setState($state);
194  $_SESSION['state'] = $state;
195
196  $authUrl = $client->createAuthUrl();
197  $htmlBody = <<<END
198  <h3>Authorization Required</h3>
199  <p>You need to <a href="$authUrl">authorize access</a> before proceeding.<p>
200END;
201}
202?>
203
204<!DOCTYPE html>
205<html>
206<head>
207<title>Upload Video to YouTube using PHP by CodexWorld</title>
208</head>
209<body>
210 <div class="uplink"><a href="<?php echo BASE_URL; ?>">New Upload</a></div>
211 <div class="content">
212  <!-- Display uploaded video info -->
213  <?php echo $htmlBody; ?>
214 </div>
215</body>
216</html>```
217コード