How to use correctly google drive API? - google-apis-explorer

Question

I have developed the following code based on other code I found on the internet, but it does not work.
Can someone help me to understand my issue?
I get an error saying I don't have the right.
What is the problem?
Thank you very much for your support, that will be well appreciated.
var tokenService_ = function(){return ScriptApp.getOAuthToken()};
function exe() {
var listObj = reportTeamDrivePermissions('id of the folder');
console.log(listObj.toString());
}
function reportTeamDrivePermissions(driveId) {
// Reading the Drive permissions
var options = {"supportsAllDrives": true, "fields": 'permissions,nextPageToken', "pageSize":100};
var paramString = Object.keys(options).map(function(key) {
return encodeURIComponent(key) + '=' + encodeURIComponent(options[key]);
}).join('&');
var url = "files/"+driveId+"/permissions";
url = url + (url.indexOf('?') >= 0 ? '&' : '?') + paramString;
url = "https://www.googleapis.com/drive/v3/" + url;
var fetchOptions = {method:"GET",muteHttpExceptions:true, contentType:"application/json", headers:{Authorization:"Bearer "+tokenService_()}};
var response = UrlFetchApp.fetch(url, fetchOptions);
if(response.getResponseCode() != 200){
throw new Error(response.getContentText());
} else {
var PermissionListResource = JSON.parse(response.getContentText());
}
var myPermisionList = PermissionListResource.permissions;
var nextPageToken = PermissionListResource.nextPageToken;
while (nextPageToken != null) {
// Reading the Drive permissions
options = {"supportsAllDrives": true, "fields": 'permissions,nextPageToken', "pageSize":100, 'pageToken': nextPageToken};
paramString = Object.keys(options).map(function(key) {
return encodeURIComponent(key) + '=' + encodeURIComponent(options[key]);
}).join('&');
url = "files/"+driveId+"/permissions";
url = url + (url.indexOf('?') >= 0 ? '&' : '?') + paramString;
url = "https://www.googleapis.com/drive/v3/" + url;
fetchOptions = {method:"GET",muteHttpExceptions:true, contentType:"application/json", headers: {Authorization:"Bearer "+tokenService_()}}
response = UrlFetchApp.fetch(url, fetchOptions)
if(response.getResponseCode() != 200){
throw new Error(response.getContentText());
} else {
var PermissionListResource2 = JSON.parse(response.getContentText());
}
myPermisionList = myPermisionList.concat(PermissionListResource2.permissions);
nextPageToken = myPermisionObject2.nextPageToken;
}
return myPermisionList;
}